CartThe International Society for Trenchless Technology
Corporate Directory
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| Company | Country | Website | Affiliated Society | |
|---|---|---|---|---|
| 2MasTT | Nederland | https://www.2mastt.nl | NSTT | More detail |
| 3M Italia S.P.A | Italy | https://www.3M.it | IATT | More detail |
| 3SICP Technology Association | Japan | http://www.3sicp.jp/ | JSTT | More detail |
| A Metropolitana Ambiental | Brazil | ABRATT | More detail | |
| A.HAKPARK B.V. | Nederland | https://www.a-hak.nl | NSTT | More detail |
| A.M.F. COMPANY AMBIENTAL | Brazil | ABRATT | More detail | |
| Aardvark Constr. & Horizontal Drilling | South Africa | https://www.aardvarkdrilling.co.za | SASTT | More detail |
| Aaro Group | Australia | https://aaro.group.com | ASTT | More detail |
| Aarsleff Leidingrenovatie BV | Nederland | https://www.aarsleff-bv.nl | NSTT | More detail |
| Aarsleff Oy | Finland | FISTT | More detail | |
| Aarsleff Rohrsanierung GmbH | Germany | AATT | More detail | |
| Abaiti Engenharia e Servios LTDA | Brazil | ABRATT | More detail | |
| Abergeldie Rehabilitation Pty Ltd | Australia | http://www.abergeldie.com | ASTT | More detail |
| ACCIONA AGUA SERVICIOS, S.L.U | Spain | IBSTT | More detail | |
| Ace Pipe Cleaning, Inc. A Carylon Company | United States | https://acepipe.com/ | NASTT | More detail |
| ACEMOLE METHOD ASSOCIATION | Japan | http://www.acemole.jp/ | JSTT | More detail |
| ACOA CONSEIL | France | FSTT | More detail | |
| Adept Drainage Pty Ltd | Australia | http://www.adeptdrainage.com.au | ASTT | More detail |
| Adviesbureau Schrijvers BV | Netherlands | https://www.schrijvers.nl | NSTT | More detail |
| Adviesbureau TWEEG BV | Nederland | https://www.tweeg.nl | NSTT | More detail |
| AEAS ASOCIACIN ESPAOLA DE ABASTECIMIENTO DE AGUA Y SANEAMIENTO | Spain | IBSTT | More detail | |
| AECOM | United States | https://www.aecom.com/ | NASTT | More detail |
| AECOM New Zealand Limited | New Zealand | http://www.aecom.com | ASTT | More detail |
| Aegion Corporation - HQ | United States | https://www.aegion.com/ | NASTT | More detail |
| Africa Utility Locators | South Africa | https://www.africautilitylocators.co.za | SASTT | More detail |
| African Skyhigh Trading (Pty) Ltd | South Africa | SASTT | More detail | |
| Afry Finland Oy | Finland | https://www.afry.com | FISTT | More detail |
| AFTES | France | FSTT | More detail | |
| AGASA AGUAS DEL AARBE, S.A. | Spain | IBSTT | More detail | |
| AGRU Kunststofftechnik Gesellschaft m.b.H. | Austria | AATT | More detail | |
| AGRUQUERO THERMOPLASTIC S.L. | Spain | IBSTT | More detail | |
| AGSM AIM spa | Italy | https://www.agsm.it | IATT | More detail |
| AGUAS DE MURCIA S.A. (EMUASA) | Spain | IBSTT | More detail | |
| Airec Corporation | Japan | http://www.airec.co.jp/ | JSTT | More detail |
| Akkerman | United States | https://www.akkerman.com/ | NASTT | More detail |
| Aliaxis Utilities & Industry GmbH | Austria | AATT | More detail | |
| ALL LINER ASSOCIATION. | Japan | http://www.all-liner.jp/ | JSTT | More detail |
| Allen Watson | United Kingdom | UKSTT | More detail | |
| ALLPA INGENIERIA S.A.S. | Colombia | LAMSTT | More detail | |
| ALLPRIME BOMBAS | Brazil | ABRATT | More detail | |
| Almeida Sapata Engenharia Construoes Ltda | Brazil | ABRATT | More detail | |
| Alpe Kommunal- und Umwelttechnik GmbH & CO KG | Austria | AATT | More detail | |
| Alpha civil engineering lnc. | Japan | http://www.alpha-civil.com/ | JSTT | More detail |
| Alva-yhtit Oy | Finland | FISTT | More detail | |
| Am-Liner East | United States | https://www.amlinereast.com/ | NASTT | More detail |
| America net | Brazil | ABRATT | More detail | |
| American West Construction | United States | https://www.trustawc.com/ | NASTT | More detail |
| Amex Sanivar GmbH | Germany | GSTT | More detail | |
| Amibex (Pty) Ltd | South Africa | SASTT | More detail | |
| Amiblu | Norway | https://www.amiblu.com | UKSTT | More detail |
| Amiblu - HOBAS Rohre GmbH | Austria | AATT | More detail | |
| AMIBLU AMIANTIT SPAIN, S.A. | Spain | IBSTT | More detail | |
| Amiblu BV | Nederland | https://www.amiblu.com | NSTT | More detail |
| Amiblu Finland | Finland | https://www.amiblu.com | FISTT | More detail |
| AMIBLU FRANCE | France | FSTT | More detail | |
| Amiblu Germany GmbH | Germany | GSTT | More detail | |
| Amiblu spa | Italy | https://www.amiblu.com | IATT | More detail |
| ANDRA | France | FSTT | More detail | |
| Anese srl | Italy | IATT | More detail | |
| Anhui Tangxing Machinery Equipment Co.,Ltd. | China | http://www.tangxing.cn/ | CSTT | More detail |
| ANSAREO SERVICIOS INTEGRALES, S.L. | Spain | IBSTT | More detail | |
| Antea Nederland BV | Nederland | https://www.anteagroup.com | NSTT | More detail |
| ANZEVE PRODUCTOS SIDERURGICOS Y DE CONSTRUCCION SL | Spain | IBSTT | More detail | |
| AOC | United States | https://aocresins.com/ | NASTT | More detail |
| APACH Method Society | Japan | http://www.apach.jp | JSTT | More detail |
| APLICACIONES ESPECIALES DE INGENIERIA CIVIL S.A.(APLES) | Spain | IBSTT | More detail | |
| Applied Felts | Other | https://www.appliedfelts.com | ASTT | More detail |
| Applied Felts Ltd | United Kingdom | UKSTT | More detail | |
| Applied Felts/MaxLiner | United States | https://maxlinerusa.com/ | NASTT | More detail |
| Aqua Assets | Australia | https://www.aquaassets.com.au | ASTT | More detail |
| Aqua Metro Pty Ltd | Australia | https://www.aquametro.com.au | ASTT | More detail |
| Aqua Palvelu Oy | Finland | https://www.lahtiaqua.fi | FISTT | More detail |
| Aqua Tech Solutions Inc. | Canada | https://www.aquatech.com/ | NASTT | More detail |
| AQUALYT LIMPIEZAS GIMENO, S.L. | Spain | IBSTT | More detail | |
| AQUAREX | France | FSTT | More detail | |
| AQUATERRA SERVICIOS INFRAESTRUCTURAS S.L. | Spain | IBSTT | More detail | |
| AQUATIS a.s. | Czech Republic | CZSTT | More detail | |
| Aqwadem Smart Altyapi Yonetimi Akilli Cozumler Muh. Ltd. | Turkey | https://aqwadem.com | TSITT | More detail |
| Arcadis Australia Pacific Pty Ltd | Australia | ASTT | More detail | |
| Aries Industries, Inc. | United States | https://ariesindustries.com/ | NASTT | More detail |
| ARKIL Inpipe GmbH | Germany | GSTT | More detail | |
| Arman Oy | Finland | https://www.arman.fi | FISTT | More detail |
| Art Method Association | Japan | http://www011.upp.so-net.ne.jp/art/ | JSTT | More detail |
| Arup | United States | https://www.arup.com | NASTT | More detail |
| Ashimori Engineering Co., Ltd. | Japan | http://www.ashimori.co.jp/ashimori-eng/ | JSTT | More detail |
| Ashimori Industry Co.,Ltd. | Japan | http://www.ashimori.co.jp/ | JSTT | More detail |
| ASOE Hose Manufacturing Inc. | China | http://asoehose.com/ | CSTT | More detail |
| Asplan Viak AS | Norway | SSTT | More detail | |
| Associated Engineering | Canada | https://www.ae.ca/ | NASTT | More detail |
| AST GRUPO s.l. | Spain | IBSTT | More detail | |
| Atkins Global Ltd | United Kingdom | https://atkinsglobal.com | UKSTT | More detail |
| Atteris Pty Ltd | Australia | http://www.atteris.com | ASTT | More detail |
| Auckland Council | New Zealand | ASTT | More detail | |
| Aurecon | Australia | https://www.aurecongroup.com | ASTT | More detail |
| Ausinland Pty Ltd | Australia | ASTT | More detail | |
| Aussie Drill Kings Pty Ltd | Australia | https://okadk.com.au | ASTT | More detail |
| Aussie Trenchless Supplies Pty Ltd | Australia | https://www.aussietrenchless.com | ASTT | More detail |
| Australian Pipeline Management Pty Ltd | Australia | https://www.auspipemanagement.com.au | ASTT | More detail |
| Austunnel Pty Ltd | Australia | http://www.austunnel.com.au | ASTT | More detail |
| Avanti International | United States | https://www.avantigrout.com | NASTT | More detail |
| Avertex Utility Solutions Inc. | Canada | https://www.avertex.ca/ | NASTT | More detail |
| AXEO TP | France | FSTT | More detail | |
| Baby Mole Kyoukai | Japan | http://www.babymole.com | JSTT | More detail |
| Ballarat Underroad Boring and Excavations Pty Ltd | Australia | https://www.ballaratdrillingandexcavations.com.au | ASTT | More detail |
| Barbco Inc. | United States | https://www.barbco.com/ | NASTT | More detail |
| Barhale Construction Plc | United Kingdom | UKSTT | More detail | |
| Barthauer Software GmbH | Germany | GSTT | More detail | |
| Batitunnel Italia srl | Italy | IATT | More detail | |
| BAUER MAT Slurry Handling Systems - Zweigniederlassung der Bauer Maschinen GmbH | Germany | GSTT | More detail | |
| BBH Abwassertechnik UG (haftungsbeschrnkt) | Germany | GSTT | More detail | |
| Beijing Beiran Huangneng Engineering & Technologies Co. Ltd. | China | http://www.beirangroup.com/ | CSTT | More detail |
| Beijing Drainage Construction Co.,Ltd. | China | http://www.bdc.cn | CSTT | More detail |
| Beijing huanfa pipe rehabilitation co.ltd | China | http://www.hfgdxf.com/ | CSTT | More detail |
| Beijing Longkexing Trenchless Engineering Co.,Ltd. / Beijing Pro-Liner Pipetech Co., Ted. | China | CSTT | More detail | |
| Benassi srl | Italy | IATT | More detail | |
| Bennett Trenchless Engineers | United States | https://bennetttrenchless.com/ | NASTT | More detail |
| Bentonisa Bentonita do Nordeste S/A. | Brazil | ABRATT | More detail | |
| Berliner Wasser Betriebe, Netz- und Anlagenbau | Germany | GSTT | More detail | |
| BESSAC | France | FSTT | More detail | |
| Bessac Andina S.A. | Colombia | https://www.bessac-andina.com | LAMSTT | More detail |
| BG INGENIEURS CONSEIL | France | FSTT | More detail | |
| BG Risk Solutions | Australia | https://www.bgrisk.net | ASTT | More detail |
| Big Valley Service Co.,Ltd. | Japan | http://www.bvs.jp/ | JSTT | More detail |
| Bilfinger BOHR- und ROHRTECHNIK GmbH | Austria | AATT | More detail | |
| Bilfinger Tebodin Netherlands B.V. | Nederland | https://www.tebodin.bilfinger.com | NSTT | More detail |
| Bit Brokers International | United States | https://www.bitbrokers.com | NASTT | More detail |
| BKP BEROLINA POLYESTER GmbH & Co KG | Alemania | IBSTT | More detail | |
| BKP Berolina Polyester GmbH & Co.KG | Germany | GSTT | More detail | |
| Black & Veatch Hong Kong Ltd. | Hong Kong | CHKSTT | More detail | |
| Black Diamond Oilfield Rentals | United States | https://bdoilfield.com/ | NASTT | More detail |
| Blick Group | New Zealand | http://www.blick.group | ASTT | More detail |
| Bloc Contractors (Pty) Ltd | South Africa | https://- | SASTT | More detail |
| Blueco srl | Italy | IATT | More detail | |
| Bluelight Lining Ltd | United Kingdom | UKSTT | More detail | |
| BMF Engenharia | Brazil | ABRATT | More detail | |
| BMH spol. s r.o. | Czech Republic | CZSTT | More detail | |
| BMX1 ENGENHARIA LTDA | Brazil | ABRATT | More detail | |
| Bodotex Composites (Pty) Ltd | South Africa | SASTT | More detail | |
| Bofram Techniek BV | Nederland | http://www.bofram.nl | NSTT | More detail |
| Bohrtec Gesellschaft fr Bohrtechnologie mbH | Germany | GSTT | More detail | |
| Boldan Oy | Finland | https://www.boldan.fi | FISTT | More detail |
| Bolton & Menk, Inc. | United States | https://www.bolton-menk.com/ | NASTT | More detail |
| Bore Master Inc. | United States | https://www.globecontractors.com/ | NASTT | More detail |
| Borealis AG Turkiye Subesi | Turkey | http://www.borealisgroup.com/about/locations/middle-east/turkey | TSITT | More detail |
| Boretec Muhendislik Ltd. | Turkey | https://www.boretec.com.tr | TSITT | More detail |
| Bortec Laser Bore Pty Ltd | Australia | https://www.bortec.com.au | ASTT | More detail |
| Boviar srl | Italy | IATT | More detail | |
| Bowley Plumbing Services pty ltd | Australia | https://www.bowleyplumbing.com | ASTT | More detail |
| Boyd Tech, Inc. | United States | https://boydtech.us/ | NASTT | More detail |
| BR GTM EQUIPAMENTOS | Brazil | ABRATT | More detail | |
| BR Pipe Reabilitao de Tubuaes LTDA | Brazil | ABRATT | More detail | |
| Brandenburger Liner GmbH & Co. KG | Germany | GSTT | More detail | |
| Brandenburger Liner GmbH & Co. KG | Germany | IATT | More detail | |
| BRANDENBURGER LINER GmbH & Co.KG | Germany | FSTT | More detail | |
| BRAUMANN Tiefbau GmbH | Austria | AATT | More detail | |
| BRAWOSYSTEMS GmbH | Germany | GSTT | More detail | |
| Brendle GmbH & Co. KG | Germany | GSTT | More detail | |
| Brewis Engineering Ltd | United Kingdom | https://www.brewisengineering.co.uk | UKSTT | More detail |
| Brianzacque srl | Italy | IATT | More detail | |
| Brierley Associates Corporation | United States | https://www.brierleyassociates.com | NASTT | More detail |
| BRNENSKE VODARNY A KANALIZACE a.s. | Czech Republic | CZSTT | More detail | |
| Brownline | Netherlands | https://www.drillguide.com | NSTT | More detail |
| Brownline | Nederland | https://www.drillguide.com | NSTT | More detail |
| Brownline Canada | Canada | https://www.drillguide.com | NASTT | More detail |
| Brownline USA | USA | ABRATT | More detail | |
| Brownline USA | United States | https://www.drillguide.com/en/ | NASTT | More detail |
| BRP Corporation Pty Ltd | Australia | https://www.safety-shovel.com | ASTT | More detail |
| BT ITALIA spa | Italy | https://www.bt.com | IATT | More detail |
| BTrenchless | United States | https://www.btrenchless.com/ | NASTT | More detail |
| BTS Consultoria | Brazil | ABRATT | More detail | |
| Buckhurst Plant Hire Ltd | United Kingdom | UKSTT | More detail | |
| Buergofol GmbH | Germany | GSTT | More detail | |
| Bullseye Boring | Australia | http://www.bullseyeboring.com.au | ASTT | More detail |
| C Scope International | United Kingdom | UKSTT | More detail | |
| C&L Water Solutions Inc. | United States | https://www.clwsi.com | NASTT | More detail |
| C.I. TAKIRONCIVIL Corporation | Japan | http://www.tc-civil.co.jp | JSTT | More detail |
| CABARCO | Colombia | https://www.cabarco.co | LAMSTT | More detail |
| CABINET MERLIN | France | FSTT | More detail | |
| CADF spa | Italy | IATT | More detail | |
| CADRE ENGENHARIA LTDA | Brazil | ABRATT | More detail | |
| Cafi | Brazil | ABRATT | More detail | |
| Camjet | South Africa | https://- | SASTT | More detail |
| CANAL DE ISABEL II, S.A. | Spain | IBSTT | More detail | |
| Cap Holding Spa | Italy | IATT | More detail | |
| Capital Infrastructure Group | Canada | https://www.capitalinfrastructuregroup.ca/ | NASTT | More detail |
| Carylon Corporation | United States | https://caryloncorp.com/ | NASTT | More detail |
| Caston Drill Tools Co.,ltd | China | http://www.kt-zj.com | CSTT | More detail |
| CATALANA DE PERFORACIONS S.A. | Spain | IBSTT | More detail | |
| CC15 Directional Drilling | South Africa | https://- | SASTT | More detail |
| CCI & Associates, Inc. | United States | https://cciandassociates.com | NASTT | More detail |
| CCI Leidingsystemen b.v. | Nederland | https://www.cci-bv.nl | NSTT | More detail |
| CDG Engenharia | Brazil | ABRATT | More detail | |
| CEA | Australia | http://www.cea.net.au | ASTT | More detail |
| Cebo Holland B.V. | Nederland | https://www.cebo.com | NSTT | More detail |
| Central South University | China | http://en.csu.edu.cn/ | CSTT | More detail |
| Centraltubi spa | Italy | IATT | More detail | |
| CERMAK a HRACHOVEC a.s. | Czech Republic | CZSTT | More detail | |
| CETCO | Minerals Technologies | United States | https://www.cetco.com/dpg | NASTT | More detail |
| CHANTIERS D'AQUITAINE | France | FSTT | More detail | |
| CHC Construction Pte Ltd | Singapore | SGSTT | More detail | |
| Chengdu University of Technology | China | https://www.cdut.edu.cn | CSTT | More detail |
| CHIKOU CO.,LTD. | Japan | http://www.chikou.co.jp/ | JSTT | More detail |
| Chiltern Thrust Bore Ltd | United Kingdom | UKSTT | More detail | |
| China Geoscience University (Beijing) | China | https://www.cugb.edu.cn | CSTT | More detail |
| China Geoscience University (Wuhan) | China | CSTT | More detail | |
| China National Chemical Engg Group Corp Ltd | Hong Kong | CHKSTT | More detail | |
| China National Chemical Engg Group Corp Ltd | Hong Kong | CHKSTT | More detail | |
| China National Chemical Engg Group Corp Ltd. | Hong Kong | CHKSTT | More detail | |
| China National Chemical Engg Group Corp Ltd. | Hong Kong | CHKSTT | More detail | |
| China National Chemical Engg Group Corp Ltd. | Hong Kong | CHKSTT | More detail | |
| China Star Driectional Drilling Tools Co., Ltd. | China | https://www.chinastarhdd.com | CSTT | More detail |
| City of Cape Town | South Africa | https://- | SASTT | More detail |
| City of Cape Town | South Africa | SASTT | More detail | |
| City of Tshwane | South Africa | https://- | SASTT | More detail |
| Clancy Docwra Ltd | United Kingdom | UKSTT | More detail | |
| CLARIANT | France | FSTT | More detail | |
| Clariant Produkte (Deutschland) GmbH | Germany | GSTT | More detail | |
| CLARIANT SE Sucursal Espaa | Spain | IBSTT | More detail | |
| Claude H. Nix Construction | United States | https://www.chnix.com | NASTT | More detail |
| CMIJ INGENIEROS LTDA | Colombia | https://www.cmij.co | LAMSTT | More detail |
| Codevintec Italiana srl | Italy | IATT | More detail | |
| COLAS FRANCE - AGENCE DAE | France | FSTT | More detail | |
| COLOMBIAN INSTITUTE FOR SUBTERRANEAN TECHNIQUES AND TECHNOLOGIES | Colombia | https://www.lamstt.org | LAMSTT | More detail |
| Colt Technology Services S.p.A., | Italy | IATT | More detail | |
| Cometa Saneamento e Terraplanagem | Brazil | ABRATT | More detail | |
| Comgas | Brazil | ABRATT | More detail | |
| Companhia de gua e Esgoto do Cear CAGECE | Brazil | ABRATT | More detail | |
| CONCEPT'O | France | FSTT | More detail | |
| CONCRETERA TOTAL S.A. | Nicaragua | https://www.concreteratotal.com | LAMSTT | More detail |
| Conselho Regional de Engenharia Arquitetura e Agronomia do Cear | Brazil | ABRATT | More detail | |
| Consor Engineers | United States | https://www.consoreng.com | NASTT | More detail |
| Consti Talotekniikka Oy | Finland | https://www.consti.fi | FISTT | More detail |
| CONSTRUCTORA OZUL S.A.S. | Colombia | https://www.constructoraozul.com | LAMSTT | More detail |
| Construtora Rezende LTDA | Brazil | ABRATT | More detail | |
| Construvap Construes Com. Eireli | Brazil | ABRATT | More detail | |
| Contech Engineered Solutions LLC | United States | https://www.conteches.com | NASTT | More detail |
| CONTELAC LTDA. | Colombia | https://www.contelac.com | LAMSTT | More detail |
| Conval Nederland BV | Nederland | https://www.conval.nl | NSTT | More detail |
| Copros Co.,Ltd. | Japan | http://www.copros.co.jp/ | JSTT | More detail |
| COQUART & FILS | France | FSTT | More detail | |
| Core & Main | United States | https://coreandmain.com/ | NASTT | More detail |
| CORE TECH COLOMBIA S.A.S. | Colombia | https://www.coretech.com.pe | LAMSTT | More detail |
| Cretex Specialty Products | United States | https://cretexseals.com/ | NASTT | More detail |
| CSTB | France | FSTT | More detail | |
| CSV Construction (Pty) Ltd | South Africa | https://- | SASTT | More detail |
| CTI Engineering Co., Ltd. | Japan | http://www.ctie.co.jp | JSTT | More detail |
| CTL Engenharia | Brazil | ABRATT | More detail | |
| Cues, Inc | United Kingdom | UKSTT | More detail | |
| CUES, Inc. | United States | https://cuesinc.com/ | NASTT | More detail |
| D.J. Mac Cormick Contractors | Australia | http://www.djmaccormick.com.au | ASTT | More detail |
| DAI NIPPON CONSTRUCTION | Japan | http://www.dnc.co.jp/ | JSTT | More detail |
| DAIWA Exprolation & Consulting Co.,Ltd | Japan | JSTT | More detail | |
| Daiwa Giken Co.,Ltd. | Japan | http://www.daiwagiken.jp/ | JSTT | More detail |
| Danaher & Walsh APS Ltd | United Kingdom | https://www.sewer-rehab.co.uk | UKSTT | More detail |
| DANCO INTERNACIONAL SAS | Colombia | https://www.danco.co | LAMSTT | More detail |
| Dankers Bohrtechnik GmbH | Germany | GSTT | More detail | |
| Danphix srl | Italy | IATT | More detail | |
| DCS Manufacturing Pty Ltd | Australia | https://dcsmanufacturing.com.au/ | ASTT | More detail |
| DDS Rohrtechnik GmbH | Austria | https://www.dds-rohrtechnik.at | AATT | More detail |
| De Jongh Pipesystems BV | Nederland | https://www.dejonghpipesystems.nl | NSTT | More detail |
| Delete Finland Oy | Finland | https://www.delete.fi | FISTT | More detail |
| Deltares | Nederland | https://www.deltares.nl | NSTT | More detail |
| Delve Underground | United States | https://delveunderground.com/ | NASTT | More detail |
| Denso (Australia) Pty Ltd. | Australia | ASTT | More detail | |
| Denys N.V. | Italy | IATT | More detail | |
| Der Kanal | Austria | https://www.derkanal.at | AATT | More detail |
| Derrick Equipment Company | United States | https://derrick.com | NASTT | More detail |
| Die Draw Ltd | United Kingdom | UKSTT | More detail | |
| Digital Control - Australia | Australia | http://www.digitrak.com | ASTT | More detail |
| Digital Control Inc. | United States | https://digital-control.com | NASTT | More detail |
| Direct Horizontal Drilling | Canada | https://directhorizontal.com | NASTT | More detail |
| Directhitt Trenchless Pty Ltd | Australia | https://www.directhitt.com.au | ASTT | More detail |
| Diringer & Scheidel Rohrsanierung GmbH & Co KG | Austria | AATT | More detail | |
| Diringer und Scheidel Rohrsanierung GmbH & Co.KG | Germany | GSTT | More detail | |
| DitchWitch | United States | https://www.ditchwitch.com/ | NASTT | More detail |
| DITECNIA CIA. LTDA. DISTRIBUIDORA TECNICA ASOCIADA | Ecuador | https://www.ditecnia.com.ec | LAMSTT | More detail |
| Diversified Services Australia | Australia | http://www.diversifiedservices.com.au | ASTT | More detail |
| DM Civil | Australia | http://www.dmcivil.com.au | ASTT | More detail |
| Doetsch Environmental Services | United States | https://doetschenv.com | NASTT | More detail |
| Dogus Vana Ltd. | Turkey | https://www.dogusvana.com.tr | TSITT | More detail |
| Dormway Pty Ltd | Australia | http://www.dormway.com.au | ASTT | More detail |
| DP BARROS PAVIMENTAO E CONST. LTDA | Brazil | ABRATT | More detail | |
| DPSM | France | FSTT | More detail | |
| Dr.-Ing. Pecher und Partner Ingenieurgesellschaft mbH, | Germany | GSTT | More detail | |
| DRACHMA MND E SERVICOS | Brazil | ABRATT | More detail | |
| Drainforce Ltd | United Kingdom | https://www.drainforce.co.uk | UKSTT | More detail |
| DRC Construes | Brazil | ABRATT | More detail | |
| Drillers World Australia | Australia | http://www.drillersworld.com.au | ASTT | More detail |
| Drilling Solutions | Italy | IATT | More detail | |
| Drillto Trenchless Co., Ltd. | China | https://www.drillto.net | CSTT | More detail |
| DSI Tunneling LLC | United States | https://www.dsitunneling.com/ | NASTT | More detail |
| Duktus litinove systemy s.r.o. | Czech Republic | CZSTT | More detail | |
| Dunstans | Australia | https://www.dunstans.com.au | ASTT | More detail |
| Dura line | Italy | IATT | More detail | |
| DW/TXS Construction Equipment (Beijing) Co., Ltd. | China | https://www.dwtxs.com | CSTT | More detail |
| E&CC | Australia | https://www.ecc-consulting.com.au | ASTT | More detail |
| E-Berk Makina Metalurji Ltd. | Turkey | https://www.e-berk.com | TSITT | More detail |
| E. HAWLE Armaturenwerke GmbH | Austria | IBSTT | More detail | |
| EADIPS - European Association for Ductile Iron Pipe Systems | Germany | GSTT | More detail | |
| EBL | France | FSTT | More detail | |
| Ebworld srl | Italy | IATT | More detail | |
| ECILIMP, S.L. | Spain | IBSTT | More detail | |
| Eco Center spa | Italy | IATT | More detail | |
| Edge Underground | Australia | http://www.edgeunderground.co | ASTT | More detail |
| EDILTUNNEL S.r.l. | Italy | IATT | More detail | |
| Eerola-Yhtit Oy | Finland | https://www.eerolayhtiot.fi | FISTT | More detail |
| EGIS | France | FSTT | More detail | |
| EIFFAGE GC RESEAUX | France | FSTT | More detail | |
| Ekso srl | Italy | IATT | More detail | |
| ELB Equipment | South Africa | https://- | SASTT | More detail |
| ELB Equipment Pty Ltd | New Zealand | http://www.elbquip.com | ASTT | More detail |
| ELECNOR S.A. | Spain | IBSTT | More detail | |
| Electro Scan (UK) Ltd | United Kingdom | https://www.electroscan.com | UKSTT | More detail |
| Elenca srl | Italy | IATT | More detail | |
| Elgin Separation Solutions | United States | https://elginseparationsolutions.com/ | NASTT | More detail |
| ELYDAN | France | FSTT | More detail | |
| EMACSA Empresa Municipal de Aguas de Crdoba S. A. | Spain | IBSTT | More detail | |
| EMASAGRA EMPRESA MUNICIPAL DE ABASTECIMIENTO Y SANEAMIENTO DE GRANADA, S.A. | Spain | IBSTT | More detail | |
| EMASESA Empresa Metropolitana de Abastecimiento y Saneamiento de Aguas de Sevilla S.A. | Spain | IBSTT | More detail | |
| EMBASA - Empresa Baiana de guas e Saneamento S.A. | Brazil | ABRATT | More detail | |
| Empire Infrastructure | Australia | http://empireinfrastructure.com.au/ | ASTT | More detail |
| Emschergenossenschaft | Germany | GSTT | More detail | |
| ENEDIS | France | FSTT | More detail | |
| ENERECO | Italy | IATT | More detail | |
| Energy & Resource Laboratories/ITRI | Taiwan | CTSTT | More detail | |
| Eng Lee Engineering Pte Ltd | Singapore | SGSTT | More detail | |
| Engemont Contrues Ltda | Brazil | ABRATT | More detail | |
| Engeneves Obras de Infraestrutura Eireli | Brazil | ABRATT | More detail | |
| Engineering Corps, Taipei Water Department | ROC | CTSTT | More detail | |
| Enpasa Eng Pav Saneamento Ltda | Brazil | ABRATT | More detail | |
| ENVI-HORIZON Association. | Japan | http://www.envi-horizon.gr.jp | JSTT | More detail |
| Enviro Vision Pte Ltd | Singapore | SGSTT | More detail | |
| Environ Construction Co. (Pte) Ltd | Singapore | SGSTT | More detail | |
| Environmental Techniques Ltd | Ireland | UKSTT | More detail | |
| EnviroPacific - SOLVE | Australia | https://enviropacific.com.au/ | ASTT | More detail |
| ENZ USA Inc | United States | https://www.enz.com/en/home/ | NASTT | More detail |
| Ersa Muhendislik Sondaj Hizmetleri | Turkey | https://ersamuhendislik.com.tr/ | TSITT | More detail |
| Espar Tansa Kyoukai | Japan | http://www.espar.org/ | JSTT | More detail |
| Etertec GmbH & Co KG | Austria | AATT | More detail | |
| EURETEQ | France | FSTT | More detail | |
| Eurohinca EUROPEA DE HINCAS TELEDIRIGIDAS, S.A. | Spain | IBSTT | More detail | |
| Euroscavi SRL | Italy | IATT | More detail | |
| Eurozak Group AS | Bulgaria | BATT | More detail | |
| EUTIT s.r.o. | Czech Republic | CZSTT | More detail | |
| EXEO Group, Inc. | Japan | http://www.exeo.co.jp/ | JSTT | More detail |
| Extrucol S.A. | Colombia | https://www.extrucol.com | LAMSTT | More detail |
| F. Ebner GmbH | Austria | https://www.friedrich-ebner.at | AATT | More detail |
| F.LLI Tenerini Sergio & Alvaro srl | Italy | IATT | More detail | |
| Faction Fusion | United States | https://www.factionfusion.com | NASTT | More detail |
| FASTWEB spa | Italy | IATT | More detail | |
| Fernco do Brasil IND e COM LTDA | Brazil | ABRATT | More detail | |
| FERROVIAL CONSTRUCCIN, S.A. | Spain | IBSTT | More detail | |
| Fetih Muhendislik Musavirlik Ltd | Turkey | https://www.fetihmuhendislik.com.tr | TSITT | More detail |
| FGS Ind Com Ltda | Brazil | ABRATT | More detail | |
| FIBRWRAP CONSTRUCTION (M) SDN BHD | Malaysia | https://fyfeasia.com | MATT | More detail |
| Finlease | Australia | https://finlease.com.au | ASTT | More detail |
| Fischer Teamplan Ingenieurbro GmbH | Germany | GSTT | More detail | |
| FITT spa | Italy | IATT | More detail | |
| Flua BV | Nederland | https://www.flua.nl | NSTT | More detail |
| Fckersperger Maschinen GmbH | Germany | GSTT | More detail | |
| FOR-DRILL | France | FSTT | More detail | |
| FOREVER PIPE - RECONSTRUCCION CAOS SA | Argentina | https://www.reconstruccion.com.ar | LAMSTT | More detail |
| FOREXI | France | FSTT | More detail | |
| Forssan vesihuoltoliikelaitos | Finland | FISTT | More detail | |
| FRANCE LINER | France | FSTT | More detail | |
| Franken Plastik GmbH | Germany | GSTT | More detail | |
| Frisch & Faust Tiefbau GmbH | Germany | GSTT | More detail | |
| FRP-PROLINING GmbH | Germany | GSTT | More detail | |
| FTTP BmbH | Austria | AATT | More detail | |
| Fuji Construction and Engineering Corporarion | Japan | http://www.fuji-k.jp | JSTT | More detail |
| FUJI TECOM INC.,Japan. | Japan | http://www.fujitecom.co.jp/ | JSTT | More detail |
| Fujimura Hume Co.,Ltd. | Japan | http://www.fujimura-crest.co.jp/ | JSTT | More detail |
| Fukuda Corporation | Japan | http://www.fkd.co.jp/ | JSTT | More detail |
| Fulton Hogan Construction Pty Ltd | Australia | http://www.fultonhogan.com.au | ASTT | More detail |
| Future-Proof Solutions | Australia | https://www.futureproofsolutions.com.au/ | ASTT | More detail |
| G.S.C. SERVICIOS Y REPARACIONES SOLERA, S.L. | Spain | IBSTT | More detail | |
| GABO SYSTEMTECHNIK GMBH | Italy | https://www.gabocom.de | IATT | More detail |
| Ganga Plumbers cc | South Africa | SASTT | More detail | |
| GCE Contractors Pty Ltd | Australia | https://gcecontractors.com.au/ | ASTT | More detail |
| Gebr. Rders AG | Germany | GSTT | More detail | |
| Gebr. Van Leeuwen Boringen BV | Nederland | https://www.gvlboringen.com | NSTT | More detail |
| GEL MAP GEOTECNOLOGIA | Brazil | ABRATT | More detail | |
| Gemeente Arnhem | Netherlands | https://www.arnhem.nl | NSTT | More detail |
| Gemeente Rotterdam | Nederland | https://www.rotterdam.nl | NSTT | More detail |
| GeoEngineers | United States | https://www.geoengineers.com | NASTT | More detail |
| Geolead Kyoukai | Japan | http://www.geo-lead.gr.jp/ | JSTT | More detail |
| Geonex Oy | Finland | https://www.geonex.fi | FISTT | More detail |
| Geonex, Inc. | United States | https://www.geonexgroup.com | NASTT | More detail |
| Geotree Solutions | United States | https://geotreesolutions.com | NASTT | More detail |
| Gerotto Federico srl | Italy | IATT | More detail | |
| Getech srl | Italy | IATT | More detail | |
| Gidon Infra Oy | Finland | https://www.gidoninfra.fi | FISTT | More detail |
| Gidroprom Ltd. | Ukraine | UAMTT | More detail | |
| Gidroprom Ltd. | Ukraine | https://www.novatec.ua/en/ | UAMTT | More detail |
| Glanville Environmental | United Kingdom | https://www.glanvilleenvironmental.com | UKSTT | More detail |
| GLEMFLOW | Chile | WORLD | More detail | |
| GLEMFLOW SERVICIOS SPA | Chile | https://www.glemflow.com | LAMSTT | More detail |
| Global Drill Equipamentos | Brazil | ABRATT | More detail | |
| Global Underground Corporation | United States | https://www.globalug.com/ | NASTT | More detail |
| Global Works Co.,Ltd. | Japan | http://global-w.com/ | JSTT | More detail |
| Globalsan Saneamento e Construes LTDA | Brazil | ABRATT | More detail | |
| GM Microtunnelling | Australia | http://www.gmmicrotunnelling.com.au | ASTT | More detail |
| GMAC Utilities | United Kingdom | https://www.gmacutilities.com | UKSTT | More detail |
| GMB Rioleringstechnieken B.V. | Nederland | https://www.gmb.eu | NSTT | More detail |
| GN Solids Control | Australia | http://www.gnsolidscontrol.com | ASTT | More detail |
| Goker Madencilik Ltd. | Turkey | https://www.gokerys.com | TSITT | More detail |
| Golder | Australia | ASTT | More detail | |
| Gollwitzer GmbH | Germany | GSTT | More detail | |
| Greater Western Water | Australia | https://www.gww.com.au | ASTT | More detail |
| Groundtec Co.,Ltd. | Japan | http://www.grountec.net/ | JSTT | More detail |
| GROUPE GENDRY | France | FSTT | More detail | |
| GRUPO CANALIS | Spain | IBSTT | More detail | |
| Grupo DD LIMP | Brazil | ABRATT | More detail | |
| GRUPO NAVEC SERVICIOS INDUSTRIALES, S.L. | Spain | IBSTT | More detail | |
| Gruppo Hera | Italy | IATT | More detail | |
| Guanli Environmental Technology (Shanghai) Co., Ltd. | China | https://www.guanli-sh.com | CSTT | More detail |
| Guilin Huali Heavy Industries Co.,Ltd. | China | https://www.gxhualicn.com | CSTT | More detail |
| H-NAC CO.,LTD. | Japan | http://www.h-nac-hp.co.jp/ | JSTT | More detail |
| H.H. Drill-Tech Drilling Machinery Co., Ltd. | China | https://www.hh-jx.com | CSTT | More detail |
| Haminan Vesi liikelaitos | Finland | https://www.haminanvesi.fi | FISTT | More detail |
| HammerHead Trenchless Equipment | United States | https://www.hammerheadtrenchless.com/ | NASTT | More detail |
| Hanattec Comercio e Tecnologia Ambiental Ltda | Brazil | ABRATT | More detail | |
| Hangzhou Hua Shi Pipeline Engineering Co., Ltd. | China | https://www.huashi168.com | CSTT | More detail |
| Hangzhou NO-DIG Technology Co.,Ltd. / Ruilai (Shanghai) Ecotechnology Co., Ltd. | China | CSTT | More detail | |
| Hard Metals Australia Pty Limited | Australia | http://www.hardmetals.com/ | ASTT | More detail |
| HB Adviesbureau BV | Nederland | https://www.hbadvies.nl | NSTT | More detail |
| HB Trenchless, LLC | United States | https://www.hbtrenchless.com/ | NASTT | More detail |
| HDD Africa cc | South Africa | https://- | SASTT | More detail |
| HDI | France | FSTT | More detail | |
| HDI Lucas | Australia | https://www.entrepose.com/en/hdi/ | ASTT | More detail |
| HEB Construction | New Zealand | https://www.heb.co.nz | ASTT | More detail |
| HEBEI GN SOLIDS CONTROL CO., LTD | China | http://www.gnsolidscontrol.com | CSTT | More detail |
| HECOX S.A.S. | Colombia | https://www.hecox.co | LAMSTT | More detail |
| Heijmans Civiel BV | Nederland | https://www.heijmans.nl/nl/activiteiten/boortechnieken/ | NSTT | More detail |
| Hejian City Feilong Retop Rock Bit Manufacture Co., Ltd. | China | http://www.flbit.com | CSTT | More detail |
| Henan North China Foundation Engineering Co., Ltd. | China | https://www.huabeijishu.com | CSTT | More detail |
| Henan Zhongtuo Petroleum Engineering Incorporated Company | China | https://www.ztxf.com.cn | CSTT | More detail |
| HERMES TECHNOLOGIE | France | FSTT | More detail | |
| Hermes Technologie Ltd | United Kingdom | UKSTT | More detail | |
| HERMES TECHNOLOGIE s.r.o. | Czech Republic | CZSTT | More detail | |
| HERRENKNECHT | Germany | FSTT | More detail | |
| HERRENKNECHT | France | FSTT | More detail | |
| Herrenknecht AG | Australia | ASTT | More detail | |
| Herrenknecht AG | Germany | GSTT | More detail | |
| Herrenknecht AG | Colombia | https://www.herrenknecht.de | LAMSTT | More detail |
| HERRENKNECHT DO BRASIL MAQUINAS E EQUIPAMENTOS | Brazil | ABRATT | More detail | |
| Herrenknecht International Ltd | United Kingdom | UKSTT | More detail | |
| Herrenknecht Tunneling Service | Russian Federation | https://www.herrenknecht.ru | RSTT | More detail |
| Herrenknecht Tunnelling Systems | United States | https://www.herrenknecht.com/en/ | NASTT | More detail |
| Hi-Vac Corporation | United States | https://hi-vac.com/ | NASTT | More detail |
| Hidpex Oy | Finland | https://www.hidpex.fi | FISTT | More detail |
| HIDRALTA, C.A. | Venezuela | https://www.hidralta.com | LAMSTT | More detail |
| HIDROTEC SANEJAMENT S.L. | Spain | IBSTT | More detail | |
| High Guard Pipe Association. | Japan | http://www.highguardpipe.jp/ | JSTT | More detail |
| Hikari Kouka Kyoukai | Japan | http://www.lcr.gr.jp | JSTT | More detail |
| HINODE,LTD | Japan | http://www.hinodesuido.co.jp/ | JSTT | More detail |
| Hlanganani Engineers and Projects Managers(Pty) Ltd | South Africa | SASTT | More detail | |
| Hochschule Wismar University of Applied Sciences: Technology, Business and Design Hochschulbibliothek | Germany | GSTT | More detail | |
| Holcim (Australia) Pty Ltd | Australia | http://www.humes.com.au | ASTT | More detail |
| Holland Drilling B.V. | Nederland | https://www.hollanddrilling.nl | NSTT | More detail |
| Holtec Co.,Ltd. | Japan | JSTT | More detail | |
| Horizontal Boring & Tunneling Co. | United States | https://www.hbttrenchless.com/ | NASTT | More detail |
| Hoshin Co.,Ltd. | Japan | https://hoshin.co.jp | JSTT | More detail |
| HS-Vesi Oy | Finland | http://www.hsvesi.fi | FISTT | More detail |
| HSY | Finland | https://www.hsy.fi | FISTT | More detail |
| HTS Pipe Consultants Inc. | United States | https://htspipeconsultants.com | NASTT | More detail |
| Huangshan Golden Land Electronics Inc. | China | http://www.goldenland-inc.com | CSTT | More detail |
| Hurricane Trenchless Technologie GmbH | Germany | GSTT | More detail | |
| Hynds Pipe Systems Ltd | New Zealand | http://www.hynds.co.nz | ASTT | More detail |
| I GREEN ENGINEERING SDN BHD | Malaysia | https:// igreen.eng@gmail.com | MATT | More detail |
| I GREEN ENGINEERING SDN BHD | Malaysia | https://www.i-green.my | WORLD | More detail |
| I GREEN ENGINEERING SDN BHD | Malaysia | WORLD | More detail | |
| I.CO.P. SpA | Italy | IATT | More detail | |
| I.S.T. IBERICA DE INNOVACIONES S.L.U. | Colombia | https://www.ist-web.com | LAMSTT | More detail |
| IBAK Helmut Hunger GmbH & Co. KG | Germany | GSTT | More detail | |
| IBAK_Robotics_GmbH | Germany | GSTT | More detail | |
| IBG Hydro Tech GmbH | Germany | IATT | More detail | |
| IBG Hydro Tech GmbH | Germany | GSTT | More detail | |
| ICADAT SPA | Chile | https://www.icadat.cl | LAMSTT | More detail |
| IDESTRA S.A. | Colombia | https://www.idestra.net | LAMSTT | More detail |
| IDROAMBIENTE SRL | Italy | IATT | More detail | |
| IDS GeoRadar s.r.l. | Italy | IATT | More detail | |
| IGR Srl | Italy | https://www.studiogheos.net | IATT | More detail |
| IKT | United Kingdom | https://www.ikt.institute | UKSTT | More detail |
| IKT - Institut fr Unterirdische Infrastruktur gGmbH | Germany | GSTT | More detail | |
| IKT Nederland | Netherlands | https://www.ikt-nederland.nl | NSTT | More detail |
| Iliria srl | Italy | IATT | More detail | |
| Imdex do Brasil Industria e Comercio Ltda | Brazil | ABRATT | More detail | |
| Imerys | United States | https://www.imerys.com/ | NASTT | More detail |
| Imerys Aluminates Ltd | United Kingdom | https://www.kerneos.com | UKSTT | More detail |
| IMESAPI, S.A. | Spain | IBSTT | More detail | |
| Implenia Schweiz AG Special Foundations Trenchless | Switzerland | GSTT | More detail | |
| Impreg | United States | ABRATT | More detail | |
| IMPREG (AUSTRALIA) PTY LTD | Australia | https://www.impreg.au | ASTT | More detail |
| iMPREG GmbH | Germany | GSTT | More detail | |
| IMPREG LLC | Ecuador | https://www.impreg.com | LAMSTT | More detail |
| Impresa La Falce spa | Italy | IATT | More detail | |
| IMPRESA TRE COLLI | Italy | https://www.impresatrecolli.com | IATT | More detail |
| IMS Robotics GmbH | Germany | GSTT | More detail | |
| IMS Robotics GmbH | Germany | AATT | More detail | |
| IMS Robotics UK Ltd | United Kingdom | UKSTT | More detail | |
| IN.TE.CO Srl | Italy | IATT | More detail | |
| Incline Inspections | South Africa | https://- | SASTT | More detail |
| Independent Sewer Consulting Services Pty Ltd | Australia | http://www.iscservices.com.au | ASTT | More detail |
| INESCO CONSTRUCTORA, S.A. | Spain | IBSTT | More detail | |
| Infra-Techno Co.,Ltd. | Japan | http://infratechno.co.jp/ | JSTT | More detail |
| INFRANEO | France | FSTT | More detail | |
| INFRANEO, S.L. | Spain | IBSTT | More detail | |
| INGENIERIA Y CONTRATOS S.A.S. | Colombia | https://www.ingenieriaycontratos.com | LAMSTT | More detail |
| INGENIERIA Y SERVICIOS ORBITEC SPA | Chile | https://www.orbitec.cl | LAMSTT | More detail |
| Ingenieurbro Weidt | Germany | GSTT | More detail | |
| Ingerop South Africa (Pty)Ltd | South Africa | https://- | SASTT | More detail |
| IngSoft GmbH | Germany | GSTT | More detail | |
| INNOVACIONES TECNOLOGICAS PARA EL SANEAMIENTO S.L. (INTESAN) | Spain | IBSTT | More detail | |
| Innovations Amplified | United States | https://www.innovationsam.com/ | NASTT | More detail |
| Inrock | Italy | IATT | More detail | |
| INSERCON, S.A. | Spain | IBSTT | More detail | |
| INSET s.r.o. | Czech Republic | CZSTT | More detail | |
| Insituform Pacific Pty Ltd | Australia | ASTT | More detail | |
| INSITUFORM TECHNOLOGIES IBERICA S.A. | Spain | IBSTT | More detail | |
| Insituform Technologies,Inc | Japan | http://www.insituform.gr.jp | JSTT | More detail |
| Institute of Exploration Technique of CAGS | China | https://www.cniet.cgs.gov.cn | CSTT | More detail |
| Intec Co.,Ltd. | Japan | http://www.intec-jp.net/ | JSTT | More detail |
| Interflow Pty Ltd | Australia | http://www.interflow.com.au/ | ASTT | More detail |
| Interstate Engineering, Inc. | United States | https://www.interstateeng.com/ | NASTT | More detail |
| IPEX, Inc. | Canada | https://www.ipexna.com | NASTT | More detail |
| Iplex Pipelines Australia | Australia | http://www.iplex.com.au | ASTT | More detail |
| Ipogeo srl | Italy | IATT | More detail | |
| IQS Engineering AG | Germany | GSTT | More detail | |
| IRETI SPA | Italy | IATT | More detail | |
| Irriport GmbH | Germany | GSTT | More detail | |
| ISEKI Poly-Tech, Inc. | Japan | http://www.iseki-polytech.com/ | JSTT | More detail |
| IST IBERICA DE INNOVACIONES S.L. | Spain | IBSTT | More detail | |
| IST Latino Amrica SAS | Colombia | ABRATT | More detail | |
| IVAH-TEC CONSTRUES E SERVIOS | Brazil | ABRATT | More detail | |
| IVIS Inc. | Canada | https://www.ivisinc.com/ | NASTT | More detail |
| Iwashita Sangyou,K.K. | Japan | http://www.iwashita-net.net/index.html | JSTT | More detail |
| J&R Contracting Limited | New Zealand | https://www.jrcontracting.co.nz | ASTT | More detail |
| Jacobs Engineering Group - World HQ | United States | https://www.jacobs.com/ | NASTT | More detail |
| JAMME KLEBER | France | FSTT | More detail | |
| Janssen Rioleringstechniek | Netherlands | https://www.riotech.nl | NSTT | More detail |
| Japan Civil engineering Consultants Association | Japan | http://www.jcca.or.jp/ | JSTT | More detail |
| Japan Hume Pipe Association. | Japan | http://www.hume-pipe.org | JSTT | More detail |
| Japan Microtunneling Association | Japan | http://www.suisinkyo.or.jp/index.html | JSTT | More detail |
| Japan Pipe Rehabilitation Quality Assurance Association | Japan | http://hinkakukyo.jp/ | JSTT | More detail |
| Japan Resinconcrete Producs Association | Japan | JSTT | More detail | |
| Japan Sewer Collection System Maintenance Association | Japan | http://www.jascoma.com/ | JSTT | More detail |
| Japan Super Line Pipe Association. | Japan | http://www.j-slp.jp/ | JSTT | More detail |
| JB Trenchless Pty Ltd | Australia | https://www.jbtrenchless.com | ASTT | More detail |
| JBP COMPOSITES | Spain | IBSTT | More detail | |
| JBP CONSULTANCY AND SERVICES (BORJE / FRANK) | Malaysia | http://www.jbp-consultancy.com | MATT | More detail |
| JC PORTAL DRILLING SUPPLIES S.A.S. | Colombia | https://www.jcpds.com.mx | LAMSTT | More detail |
| Jet Vacs Services Pte Ltd | Singapore | SGSTT | More detail | |
| JetAire (DC) Ltd | United Kingdom | https://www.jetaire.co.uk | UKSTT | More detail |
| JFE Engineering Corporation | Japan | JSTT | More detail | |
| JHB Water (SOC) Ltd | South Africa | https://- | SASTT | More detail |
| Jiangsu Dilong Heavy Machinery Co.,Ltd | China | https://www.njdl.com | CSTT | More detail |
| Jiangsu Goodeng Engineering Machinery Assembling Co.,Ltd. | China | https://www.goodeng.com.cn | CSTT | More detail |
| JMPCORPORATION | Japan | JSTT | More detail | |
| Jobanboring Corporation Limited | Japan | http://www8.ocn.ne.jp/~shmaker/ | JSTT | More detail |
| Joensuun kaupunki | Finland | FISTT | More detail | |
| Joon Thiam Industrial Services Pte Ltd | Singapore | SGSTT | More detail | |
| Jos Carlos Monteiro Eireli | Brazil | ABRATT | More detail | |
| JR Souken Information Systems Co.Ltd. | Japan | http://www.jrsi.co.jp | JSTT | More detail |
| JT-Elektronik GmbH | Germany | GSTT | More detail | |
| JZ Engenharia e Comercio LTDA | Brazil | ABRATT | More detail | |
| K-Boringen nv | België | https://www.k-boringen.com | NSTT | More detail |
| KAD Civils | South Africa | SASTT | More detail | |
| KAISER Technology Pty Ltd | Australia | ASTT | More detail | |
| Kanaflex Industria e Plasticos | Brazil | ABRATT | More detail | |
| Kanalize Insaat Ticaret Ltd | Turkey | https://kanalize.com.tr | TSITT | More detail |
| Kanaltek Insaat Ticaret Ltd | Turkey | https://kanaltek.com | TSITT | More detail |
| KANSEI Kogyo Co.,Ltd | Japan | http://www.kansei-pipe.co.jp/ | JSTT | More detail |
| Karl Schngen KG | Germany | GSTT | More detail | |
| Karl Weiss Technologies GmbH | Germany | GSTT | More detail | |
| Kaukotek Oy | Finland | FISTT | More detail | |
| Kawasaki Geological Engineering Co.,Ltd. | Japan | http://www.kge.co.jp/ | JSTT | More detail |
| Kayeworx (Pty) Ltd | South Africa | SASTT | More detail | |
| KB-drain method association | Japan | http://kb-drain.jp/ | JSTT | More detail |
| KEBOS QUALIFICAO PARA PROFISSIONAIS EM MND | Brazil | ABRATT | More detail | |
| Kellogg Brown & Root Pty Ltd | Australia | https://www.kbr.com | ASTT | More detail |
| Kemin Vesi Oy | Finland | https://www.keminvesi.fi | FISTT | More detail |
| Kennedy/Jenks Consultants Inc. | United States | https://www.kennedyjenks.com | NASTT | More detail |
| Keramo Steinzeug N.V. Oddzia w Polsce | Poland | PFTT | More detail | |
| KGS Inc. | Japan | https://www.kgs-inc.co.jp/ | JSTT | More detail |
| KIDOH CONSTRUCTION CO., LTD. | Japan | http://www.kidoh.co.jp/ | JSTT | More detail |
| Kiewit Engineering Group Inc. | United States | https://www.kiewit.com | NASTT | More detail |
| Kiewit Infrastructure Co. | United States | https://www.kiewit.com/ | NASTT | More detail |
| Kimley-Horn and Associates, Inc. | United States | https://www.kimley-horn.com/ | NASTT | More detail |
| King-drilling Science Techniques HDD Tools Limited Company | China | http://www.king-drilling.net | CSTT | More detail |
| Kirkkonummen Vesi | Finland | https://www.kirkkonummi.fi/kirkkonummen-vesi | FISTT | More detail |
| Kitano-Kogyo Co.,Ltd. | Japan | http://www.kitano-kg.co.jp/ | JSTT | More detail |
| Kleinfelder | United States | https://www.kleinfelder.com/ | NASTT | More detail |
| Knox City Council | Australia | ASTT | More detail | |
| KO-KA s.r.o. | Czech Republic | CZSTT | More detail | |
| KOBUS, Inc. | United States | https://kobus-inc.com | NASTT | More detail |
| Kondex Corporation | United States | https://www.kondex.com/ | NASTT | More detail |
| Kouvolan Vesi | Finland | http://www.kouvolanvesi.fi/ | FISTT | More detail |
| Kouwenberg Infra | Netherlands | https://www.kouwenberginfra.nl | NSTT | More detail |
| Kouwenberg Infra BV | Nederland | https://www.kouwenberginfra.nl | NSTT | More detail |
| Kowa Kasei Co.,Ltd. | Japan | http://www.kowa-ksi.co.jp/ | JSTT | More detail |
| KRAFT & WAERME GmbH | Austria | AATT | More detail | |
| Kragten | Nederland | https://www.kragten.nl | NSTT | More detail |
| Kubota ChemiX Co.,Ltd. | Japan | https://www.kubota-chemix.co.jp/ | JSTT | More detail |
| Kubota Construction Co.,Ltd. | Japan | https://www.kubota-const.co.jp/ | JSTT | More detail |
| Kumagai Gumi Co.,Ltd. | Japan | https://www.kumagaigumi.co.jp/ | JSTT | More detail |
| Kumpen NV, Afdeling Renovatietechnieken | België | https://www.kumpen.be | NSTT | More detail |
| Kuopion Vesi Oy | Finland | http://www.kuopionvesi.fi/ | FISTT | More detail |
| KURIMOTO ,LTD. | Japan | http://kuricon-soc.co.jp/ | JSTT | More detail |
| kwik-ZIP Spacers | Australia | http://www.kwikzip.com | ASTT | More detail |
| Kymen Vesi Oy | Finland | http://www.kymenvesi.fi/ | FISTT | More detail |
| L P Pipe Civil | Australia | https://www.lppipecivil.com/ | ASTT | More detail |
| L.I Servios de Perfuraoes e Sondagens Ltda Me | Brazil | ABRATT | More detail | |
| Laney Directional Drilling Co. | United States | https://laneydrilling.com | NASTT | More detail |
| Langfang Huayuan Mechanical & Electrical Engineering Co Ltd | Hong Kong | http://www.hycrossing.com/en/ | CHKSTT | More detail |
| Langfang Huayuan Mechanical and Electrical Engineering Co.,Ltd. | China | https://www.hycrossing.com | CSTT | More detail |
| Lnnen alituspalvelu Oy | Finland | http://www.lannenalitus.com/ | FISTT | More detail |
| Larrys Plumbing | United States | https://www.larrysplumbinginc.com/ | NASTT | More detail |
| Lassila&Tikanoja Oyj | Finland | http://www.lassila-tikanoja.fi/ | FISTT | More detail |
| LaValley Industries | United States | https://www.lavalleyindustries.com/ | NASTT | More detail |
| Laviosa Chimica Mineraria SpA | Italy | IATT | More detail | |
| LBtech a.s. | Czech Republic | CZSTT | More detail | |
| LEADING GLOBAL ENGINEERING SDN BHD | Malaysia | http://www.leadingglobal.com.my | MATT | More detail |
| Legendpipe Method Association | Japan | http://www.legend-pipe.jp/ | JSTT | More detail |
| LEMAM CONSTRUES | Brazil | ABRATT | More detail | |
| Lenfiber spa | Italy | IATT | More detail | |
| LHC, S.L. | Spain | IBSTT | More detail | |
| Lian Shing Construction Co Pte Ltd | Singapore | SGSTT | More detail | |
| LICUAS S.A. | Spain | IBSTT | More detail | |
| LIMPIEZAS MUNAR FULLANA, S.A. | Spain | IBSTT | More detail | |
| Liner Express Oy | Finland | https://www.linerexpress.fi | FISTT | More detail |
| lineTEC- Vereinigte Filzfabriken AG | Germany | GSTT | More detail | |
| Lining Division Ltd | United Kingdom | https://www.liningdivision.com | UKSTT | More detail |
| Lithos Engineering | United States | https://lithoseng.com | NASTT | More detail |
| LKL International Pty Ltd | Australia | http://www.ausiemole.com.au | ASTT | More detail |
| LMR Drilling GmbH | Germany | GSTT | More detail | |
| Logan Clay Products | United States | https://www.loganclaypipe.com/ | NASTT | More detail |
| Logiball Inc. | Canada | https://www.logiball.com | NASTT | More detail |
| Lowe Comrcio e Servios Ltda | Brazil | ABRATT | More detail | |
| LS Planning Co.,Ltd. | Japan | http://www.lsweb.co.jp/micro-tunnelling/index.html | JSTT | More detail |
| Lucking Utility Services Ltd | United Kingdom | UKSTT | More detail | |
| LUDWIG PFEIFFER Hoch- und Tiefbau GmbH & Co. KG | Germany | GSTT | More detail | |
| Ludwig Pfeiffer Hoch- und Tiefbau GmbH und Co KG | Austria | AATT | More detail | |
| LVI-Kilpimaa Oy | Finland | http://kilpimaa.com/ | FISTT | More detail |
| LWS COMRCIO E SERVIOS DE EQUIPAMENTOS PARA SANEAMENTO | Brazil | ABRATT | More detail | |
| Lyners Consulting Engineers | South Africa | https://- | SASTT | More detail |
| M. Tucker & Sons Pty Ltd | Australia | http://www.mtuckerandsons.wix.com/mtuckerandsons | ASTT | More detail |
| M.E. Andrews and Associates Limited o/a Andrews.Engineer | Canada | https://www.andrews.engineer/ | NASTT | More detail |
| M.J. Oomen | Nederland | https://www.mjoomen.nl | NSTT | More detail |
| Maakone Oy | Finland | https://www.maakone.com | FISTT | More detail |
| Maanrakennus B. Dahlbacka Oy | Finland | https://www.dahlbacka.com | FISTT | More detail |
| Maarakennus Kamara Oy | Finland | FISTT | More detail | |
| Madewell Products Corp. | United States | https://www.madewell.net/ | NASTT | More detail |
| Mainline Civil Engineering | South Africa | https://- | SASTT | More detail |
| Mainlining America | United States | https://mainlining.com/ | NASTT | More detail |
| Mammoth Equipment Limited | United Kingdom | https://www.mammothequipment.co.uk | UKSTT | More detail |
| Manufacturas de Cemento S.A. | Colombia | https://www.titancemento.com | LAMSTT | More detail |
| March Cato Ltd | New Zealand | http://www.marchcato.co.nz | ASTT | More detail |
| Marche Multiservizi spa | Italy | IATT | More detail | |
| Marley | New Zealand | ASTT | More detail | |
| Martin & East (Pty) Ltd | South Africa | SASTT | More detail | |
| MAS-GNB | Russian Federation | https://www.masgnb.ru | RSTT | More detail |
| Maskell Productions Ltd | New Zealand | http://www.maskell.co.nz | ASTT | More detail |
| MAWV Mrkische Abwasser- und Wasserzweckverband | Germany | GSTT | More detail | |
| Maxibor Australia Pty Limited | Australia | https://www.maxibor.com.au | ASTT | More detail |
| MC BAUCHEMIE SPAIN, S.L. | Spain | IBSTT | More detail | |
| MC-Bauchemie Mller GmbH & Co. KG | Germany | GSTT | More detail | |
| McBerns Innovative Solutions | Australia | ASTT | More detail | |
| McConnell Dowell Constructors (Aust) Pty Ltd | Australia | https://www.mcconnelldowell.com | ASTT | More detail |
| McElroy Manufacturing Inc. | Australia | http://www.mcelroy.com | ASTT | More detail |
| MCFLUID EQUIP IND LTDA | Brazil | ABRATT | More detail | |
| McLaughlin, A Vermeer Brand | United States | https://www.mightymole.com | NASTT | More detail |
| McMillen Jacobs Associates (NZ) | New Zealand | https://www.mcmjac.com | ASTT | More detail |
| MDS-MATERIEL DE SONDAGE | France | FSTT | More detail | |
| Mears Group, Inc. - Corporate HQ | United States | https://www.mears.net/ | NASTT | More detail |
| Megger Germany GmbH | Germany | GSTT | More detail | |
| MEJORAS ENERGETICAS - TECNOLOGIAS PARA SANEAMIENTO S.L. (TECSAN) | Spain | IBSTT | More detail | |
| Melbourne Water | Australia | https://melbournewater.com.au | ASTT | More detail |
| Melhor Forma Construtora Ltda | Brazil | ABRATT | More detail | |
| Melker Baltik O | Estonia | https://melkerbaltik.eu | FISTT | More detail |
| MENG IEONG ENVIRONMENTAL PROTECTION ENGINEERING CO., LTD. | Macao | WORLD | More detail | |
| MESCO, Inc. | Japan | http://www.mesco.co.jp | JSTT | More detail |
| META WATER Co.,Ltd. | Japan | https://www.metawater.co.jp/ | JSTT | More detail |
| METRO ENGENHARIA E CONSULTORIA LTDA | Brazil | ABRATT | More detail | |
| Metrocorp Technologies | Australia | http://www.metrocorp.com.au | ASTT | More detail |
| METROPOLE GRAND LYON | France | FSTT | More detail | |
| MEXICHEM BRASIL - AMANCO WAVIN | Brazil | https://www.wavin.com/pt-br/amanco-wavin-brasil | LAMSTT | More detail |
| MEXICHEM COLOMBIA S.A.S.-PAVCO WAVIN | Colombia | https://www.mexichem.com.co | LAMSTT | More detail |
| MEXICHEM ECUADOR S.A.-PLASTIGAMA WAVIN | Ecuador | https://www.plastigama.com | LAMSTT | More detail |
| MEXICHEM PERU S.A. | Peru | https://www.wavin.com/es-pe | LAMSTT | More detail |
| Michael Byrne Manufacturing | United States | https://www.byrnegroup.com | NASTT | More detail |
| Michels Canada | Canada | https://www.michelscanada.com/ | NASTT | More detail |
| Michels Corporation | United States | https://www.michels.us | NASTT | More detail |
| Michels Trenchless Pty. Ltd. | Australia | ASTT | More detail | |
| MICHLOVSKY-protlaky a.s. | Czech Republic | CZSTT | More detail | |
| Miller Pipeline Corporation | United States | https://millerpipeline.com | NASTT | More detail |
| MILLINGMOLEASSOCIATION | Japan | http://www.milling-mole.jp/ | JSTT | More detail |
| MIRAITCorporation | Japan | https://www.mrt.mirait.co.jp/ | JSTT | More detail |
| Misakura Co.,Ltd. | Japan | https://www.misakura.info/ | JSTT | More detail |
| Miyama Kogyo Co.,Ltd. | Japan | https://ttp://www.miyama-nextep.co.jp/ | JSTT | More detail |
| Miyanaga Construction | Japan | http://www.miyanaga-net.co,jp | JSTT | More detail |
| MK Industria e Comercio de Produtos Sinteticos Ltda | Brazil | ABRATT | More detail | |
| MK Surveys | United Kingdom | UKSTT | More detail | |
| Mladen Buntich Construction Co., Inc. | United States | https://buntich.com/ | NASTT | More detail |
| MM Kanal-Rohr-Sanierung GmbH | Austria | AATT | More detail | |
| MM spa | Italy | IATT | More detail | |
| Mole Construction | South Africa | SASTT | More detail | |
| Moll Gestuurd Boren | Nederland | https://www.gestuurdboren.nl | NSTT | More detail |
| MOLL-prd GmbH & Co. KG | Germany | GSTT | More detail | |
| Monaco spa | Italy | IATT | More detail | |
| MONTECZ S.A. | Colombia | https://www.montecz.com | LAMSTT | More detail |
| MONTINPETROL | Colombia | https://www.montinpetrol.com | LAMSTT | More detail |
| MORIMOTO CORPORATION | Japan | https://www.morimotogui.co.kp/ | JSTT | More detail |
| Morken Brasil | Brazil | ABRATT | More detail | |
| Morrison Utility Services | United Kingdom | UKSTT | More detail | |
| Mosinzhproekt Institute | Russian Federation | https://www.mosinzhproekt.ru | RSTT | More detail |
| MOTORRENS, S.L. | Spain | IBSTT | More detail | |
| Mott MacDonald | United States | https://www.mottmac.com | NASTT | More detail |
| MOURO SOLUES EM SERVIOS | Brazil | ABRATT | More detail | |
| MT a.s. | Czech Republic | CZSTT | More detail | |
| MTS DO BRASIL | Brazil | ABRATT | More detail | |
| mts Microtunneling Systems GmbH | Germany | GSTT | More detail | |
| Mudex | Australia | https://www.mudex.com.au | ASTT | More detail |
| Mullane Trenchless Pipeline Solutions Pty Ltd | Australia | ASTT | More detail | |
| MWH Taiwan | Taiwan | CTSTT | More detail | |
| N.JETEngineering | Japan | http://n-jet.co.jp/ | JSTT | More detail |
| NAGANO HYDRAULICS.INC. | Japan | http://www.nagano-yuki.co.jp/ | JSTT | More detail |
| NAKANIHON ENGINEERING CONSULTANTS Co.,Ltd., | Japan | http://www.nakanihon.co.jp | JSTT | More detail |
| NANNO CONSTRUCTION CO.,LTD. | Japan | http://www.nanno.co.jp | JSTT | More detail |
| NASTT | United States | https://1 | NASTT | More detail |
| National Liner | United States | https://nationalliner.com | NASTT | More detail |
| NATURAL LINER SOLUTION | Malaysia | MATT | More detail | |
| Naylor Drainage Ltd | United Kingdom | UKSTT | More detail | |
| Nejeni Construction & Project Management (pty) Ltd | South Africa | https://www.nejeni.co.za | SASTT | More detail |
| Neptune Coring | Canada | https://www.neptunecoring.com | NASTT | More detail |
| New Font Srl | Italy | IATT | More detail | |
| Nihon Suido Consultants Co.,Ltd. | Japan | http://www.nissuicon.co.jp | JSTT | More detail |
| Nihon Suidou Sekkeisya Co.,Ltd. | Japan | https://www.sekkeisya.co.jp | JSTT | More detail |
| Nikken Gijutsu Consultants Co.,Ltd. | Japan | http://www.nikken-gcon.co.jpl | JSTT | More detail |
| Nippon COMSYS Corporation | Japan | http://www.comsys.co.jp/ | JSTT | More detail |
| NIPPON HUME CORPORATION | Japan | http://www.nipponhume.co.jp | JSTT | More detail |
| Nippon Koei Co., Ltd | Japan | http://www.n-koei.co.jp | JSTT | More detail |
| Nippon Signal Co.,Ltd. | Japan | http://www.signal.co.jp | JSTT | More detail |
| NIPPON STEEL Pipeline & Engineering Co. Ltd. | Japan | https://www.nspe.nipponsteel.com/ | JSTT | More detail |
| Nippon Suiko Sekkei Co.,Ltd. | Japan | http://www.n-suiko.co.jp/ | JSTT | More detail |
| Nippon Telegraph and Telephone Corporation | Japan | http://www.ntt.co.jp/inlab/org/as.html | JSTT | More detail |
| NITTOC Co., Ltd. | Japan | http://www.nittoc.co.jp | JSTT | More detail |
| NIVOS | Finland | https://www.nivos.fi/ | FISTT | More detail |
| NiX CO.,LTD. | Japan | https://www.shinnihon-cst.co.jp/ | JSTT | More detail |
| Nix Construtora | Brazil | ABRATT | More detail | |
| NJS CO.,LTD. | Japan | http://www.njs.co.jp/ | JSTT | More detail |
| NO-DIGTEC, LLC | United States | https://www.pipeburster.com | NASTT | More detail |
| none | Germany | GSTT | More detail | |
| Norbrasil Saneamento Ltda | Brazil | ABRATT | More detail | |
| Nordic Boring Service - NORDBOS Oy | Finland | http://www.nordbos.com | FISTT | More detail |
| Norditube | Austria | UKSTT | More detail | |
| NordiTube Technologies SE | Belgium | GSTT | More detail | |
| Normec QS | Netherlands | https://www.normecgroup.com | NSTT | More detail |
| Norte Sul Hidrotecnologia e Comrcio Ltda. | Brazil | ABRATT | More detail | |
| North Star (Beijing) Machinery & Drilling Tools Co., Ltd | China | https://www.northstardrill.com | CSTT | More detail |
| Northeast Remsco Construction Inc. | United States | https://www.northeastremsco.com/ | NASTT | More detail |
| NorthStar Fluid Solutions | United States | https://northstarfluids.com/ | NASTT | More detail |
| Northumbrian Water Technical Centre | United Kingdom | UKSTT | More detail | |
| Northwest Pipe Company | United States | https://www.nwpipe.com | NASTT | More detail |
| NOUVETRA TP | France | FSTT | More detail | |
| NTT Infranet | Japan | http://www.nttinf.co.jp/ | JSTT | More detail |
| Nu Flow Technologies | United States | https://www.nuflowtechnologies.com | NASTT | More detail |
| Nu Flow Technologies 2000 Pty Ltd | Australia | http://www.nuflow.net | ASTT | More detail |
| NUC Kouhou Kyoukai | Japan | http://www.nanno.co.jp/nuc/ | JSTT | More detail |
| NuFlow Technologies | please select | WORLD | More detail | |
| NuFlow Technologies | United States | UKSTT | More detail | |
| Nukote Coating Systems International, LLC | United States | https://www.nukoteglobal.com | NASTT | More detail |
| Nurmijrven Vesi | Finland | https://www.nurmijarvi.fi | FISTT | More detail |
| Nyeleti Consulting (Pty)Ltd | South Africa | https://- | SASTT | More detail |
| OBIC | United States | https://www.obicproducts.com | NASTT | More detail |
| OCEAN WINDS, S.L. | Spain | IBSTT | More detail | |
| Octopus Electronics | South Africa | https://- | SASTT | More detail |
| OHMOTO GUMI CO.,LTD. | Japan | http://www.ohmoto.co.jp/ | JSTT | More detail |
| Ok Bit Service Inc. | United States | https://okbit.com | NASTT | More detail |
| Okumura Corporation | Japan | http://www.okumuragumi.co.jp/ | JSTT | More detail |
| OKUMURA MACHINERY CORPORATION | Japan | http://www.okumuragumi.co.jp/kikai/ | JSTT | More detail |
| On Point HDD | United States | https://www.onpointhdd.miami/ | NASTT | More detail |
| OnSite Central Ltd | United Kingdom | UKSTT | More detail | |
| Open Fiber spa | Italy | IATT | More detail | |
| Opere Geotecniche Snc | Italy | IATT | More detail | |
| OPS INFRAESTRUCTURAS Y SERVICIOS HIDRULICOS, S.L. | Spain | IBSTT | More detail | |
| OREA | France | https://www.orea-groupe.com | FSTT | More detail |
| ORGANIZACION DE CONSTRUCCIONES PAZOS, S.A. DE C.V. | Mexico | https://www.ocp98.com | WORLD | More detail |
| ORIGINAL ENGINEERING CONSULTANTS CO., LTD. | Japan | http://www.oec-solution.co.jp/ | JSTT | More detail |
| Orion Consulting | Australia | https://orionconsulting.com.au/ | ASTT | More detail |
| Orsco | South Africa | SASTT | More detail | |
| Osaka Bousui Construction Co.,Ltd. | Japan | http://www.obcc.co.jp | JSTT | More detail |
| Osaka Gas Co.,Ltd. | Japan | https://www.osakagas.co.jp/ | JSTT | More detail |
| Oulun vesi | Finland | http://www.oulunvesi.fi/ | FISTT | More detail |
| Oy Lining Ab | Finland | FISTT | More detail | |
| OYO Corporation. | Japan | http://www.oyo.co.jp/ | JSTT | More detail |
| Pacific Boring Inc. | United States | https://pacificboring.com | NASTT | More detail |
| PACIFIC TRADING GROUP S.A. | Colombia | https://www.cipacifictradinggroup.com | LAMSTT | More detail |
| PALMIERI SPA | Italy | https://www.palmierigroup.com | LAMSTT | More detail |
| Paltem Gijutsu Kyoukai | Japan | http://www.paltem.jp/ | JSTT | More detail |
| Parkland Geotechnical Ltd. | Canada | https://www.parklandgeo.com/ | NASTT | More detail |
| Passarelli Engenharia e Construo Ltda | Brazil | ABRATT | More detail | |
| Pato srl | Italy | IATT | More detail | |
| PAVIA ACQUE S.c.a r.l. | Italy | IATT | More detail | |
| PENA SPOERER Y COMPANIA S.A.-PESCO | Chile | https://www.pesco.cl | LAMSTT | More detail |
| PERFHORA PERFORACION HORIZONTAL Y APLICACIONES, S.L | Spain | IBSTT | More detail | |
| PERFORATOR GmbH | Germany | GSTT | More detail | |
| PERFOTECNICA | Colombia | https://www.perfotecnica.com.co | LAMSTT | More detail |
| Pert Servios em Obra Eireli | Brazil | ABRATT | More detail | |
| Pervomayskiy zavod ZHBI | Russian Federation | https://www.pgbinmsk.ru | RSTT | More detail |
| Peter Duffy Limited | United Kingdom | https://www.peterduffyltd.com www.drains-aid.com | UKSTT | More detail |
| Peter McCormack & Sons Ltd | United Kingdom | UKSTT | More detail | |
| Pezzimenti Laserbore Pty Ltd | Australia | http://www.pezzimenti.com.au | ASTT | More detail |
| Pezzimenti Trenchless Pty Ltd | Australia | ASTT | More detail | |
| Pezzimenti Tunnelbore Pty Ltd. | Australia | ASTT | More detail | |
| PH Ambiental | Brazil | ABRATT | More detail | |
| PICA Corporation | Canada | https://www.picacorp.com/ | NASTT | More detail |
| Picote Oy Ltd | Finland | https://www.picote.fi | FISTT | More detail |
| Picote Solutions Inc. | United States | https://picotesolutions.com | NASTT | More detail |
| Picote Solutions OY | Finland | GSTT | More detail | |
| Picote Solutions Oy Ltd | Finland | http://www.picotesolutions.com/ | FISTT | More detail |
| Picote UK Ltd | United Kingdom | UKSTT | More detail | |
| PILLET GEOTECHNIQUE SA | Switzerland | FSTT | More detail | |
| Pipe Core Pty ltd | Australia | https://pipecore.com.au | ASTT | More detail |
| Pipe Doctor Australia Pty Ltd | Australia | https://www.pipedoctor.com.au | ASTT | More detail |
| Pipe Equipment Specialists Ltd | United Kingdom | UKSTT | More detail | |
| Pipe Insight Ltd | New Zealand | ASTT | More detail | |
| Pipe MND Reabilitao de tubulao Ltda | Brazil | ABRATT | More detail | |
| PIPE REHABILITATION PTE LTD | Singapore | SGSTT | More detail | |
| Pipe Solution Reparos em Tubos LTDA | Brazil | ABRATT | More detail | |
| Pipe Tek | Australia | https://www.pipetek.com.au | ASTT | More detail |
| Pipecare srl | Italy | IATT | More detail | |
| PIPELIFE Austria GmbH & CoKG | Austria | AATT | More detail | |
| Pipelife Finland Oy | Finland | https://www.pipelife.fi | FISTT | More detail |
| Pipeline Drillers Group | Australia | https://www.pdgroup.com.au | ASTT | More detail |
| Pipeline Infrastructure | Spain | IBSTT | More detail | |
| Pipes HOBAS | Russian Federation | https://www.hobas.com | RSTT | More detail |
| PipeWorks | New Zealand | https://pipeworks.co.nz | ASTT | More detail |
| PIPEWORKS CONSTRUES LTDA | Brazil | ABRATT | More detail | |
| PKM Enterprise | United Kingdom | UKSTT | More detail | |
| Planal Tecnologia | Brazil | ABRATT | More detail | |
| Planned Maintenance (Pennine) Ltd | United Kingdom | UKSTT | More detail | |
| PLASSON DO BRASIL LTDA | Brazil | ABRATT | More detail | |
| Plastics Pipe Institute | United States | https://plasticpipe.org/ | NASTT | More detail |
| Plowman Craven | United Kingdom | https://www.plowmancraven.co.uk | UKSTT | More detail |
| PMPS Liner Technology (S) Pte Ltd | Singapore | SGSTT | More detail | |
| Pohjanmaan viemripalvelu Oy | Finland | http://hakanhjerpe.fi | FISTT | More detail |
| Polierg Industria e Comercio Ltda | Brazil | ABRATT | More detail | |
| Pontificia Universidad Javeriana | Colombia | https://www.javeriana.edu.co | LAMSTT | More detail |
| Porr a.s., OZ 7, provoz MORAVA | Czech Republic | CZSTT | More detail | |
| PORR Bau GmbH | Austria | AATT | More detail | |
| Porvoon Vesi | Finland | https://www.porvoo.fi/vesilaitos | FISTT | More detail |
| PRATOVERDE S.R.L. A SOCIO UNICO | Italy | IATT | More detail | |
| PRAZSKE VODOVODY A KANALIZACE a.s. | Czech Republic | CZSTT | More detail | |
| Predl Austria GmbH | Austria | AATT | More detail | |
| Pretec Directional Drilling, LLC | United States | https://pretecdd.com/ | NASTT | More detail |
| Prime Creative Media | Australia | https://www.primecreative.com.au | ASTT | More detail |
| PRIME DRILLING GmbH | Germany | GSTT | More detail | |
| Prime Horizontal Pty Ltd | Australia | http://primehorizontal.com/ | ASTT | More detail |
| Prime Resins, Inc. | United States | https://primeresins.com | NASTT | More detail |
| Primus Line | Germany | ABRATT | More detail | |
| PRIMUS LINE | Colombia | https://www.primusline.com | LAMSTT | More detail |
| PROCIMEC INGENIERIA S.A.S. | Colombia | https://www.procimecingenieria.com | LAMSTT | More detail |
| PROCRETO COLOMBIA S.A.S. | Colombia | https://www.procreto.co | LAMSTT | More detail |
| Profilplast Pipesystems BV | Nederland | https://www.profilplastpipesystems.nl | NSTT | More detail |
| Prokasro Mechatronik GmbH | Germany | GSTT | More detail | |
| PROKASRO MECHATRONIK GMBH | Germany | https://www.prokasro.de | LAMSTT | More detail |
| ProKASRO Services USA, Inc. | United States | https://www.prokasrousa.com/ | NASTT | More detail |
| Prorail | Nederland | https://www.prorail.nl | NSTT | More detail |
| Protective Liner Systems, Inc. | United States | https://protectivelinersystems.com/ | NASTT | More detail |
| Prysmian Cavi e Sistemi Italia | Italy | IATT | More detail | |
| Przedsibiorstwo Robt Inynieryjnych ABIKORP Sp. z o.o | Poland | https://www.abikorp.pl/ | FISTT | More detail |
| PSILAB, Inc. | United States | https://www.psilab.net | NASTT | More detail |
| PSM Rohrsanierung GmbH | Germany | GSTT | More detail | |
| PSS Hire | United Kingdom | UKSTT | More detail | |
| Public Sewer Services Ltd | United Kingdom | UKSTT | More detail | |
| Pure Technologies | Canada | https://puretechltd.com/ | NASTT | More detail |
| Putkistosaneeraus Eerola Oy | Finland | https://www.eerolayhtiot.fi/ | FISTT | More detail |
| PWN | Netherlands | https://www.pwn.nl | NSTT | More detail |
| Qalchek Pty Ltd | Australia | ASTT | More detail | |
| Qenos Pty Ltd | Australia | https://www.qenos.com | ASTT | More detail |
| QUABUS GmbH | Austria | AATT | More detail | |
| Quek & Quek Civil Engineering Pte Ltd | Singapore | SGSTT | More detail | |
| R & R McClure Excavations | Australia | http://www.rrmcclure.com.au | ASTT | More detail |
| Rabmer Gruppe | Austria | AATT | More detail | |
| Radius Plus Ltd | United Kingdom | https://www.radius-plus.co.uk/ | UKSTT | More detail |
| Rdlinger primus line GmbH | Germany | GSTT | More detail | |
| RDLINGER PRIMUS LINE GMBH | Alemania | IBSTT | More detail | |
| Raedlinger Primus Line GmbH | Germany | AATT | More detail | |
| Raedlinger Primus Line Pty Ltd | Australia | ASTT | More detail | |
| RAICOMMERCE CONSTRUCTION JSCo | Bulgaria | BATT | More detail | |
| Rain for Rent | United States | https://www.rainforrent.com | NASTT | More detail |
| Rainer Kiel Kanalsanierung GmbH | Germany | GSTT | More detail | |
| RAIPOWER ENGINEERING MACHINERY CO.,LTD | China | http://www.lkgcjx.com.cn/ | CSTT | More detail |
| Rakennuspalvelu Linna Oy | Finland | https://www.rplinna.fi/ | FISTT | More detail |
| Rakennuttajatoimisto-HTJ Oy | Finland | FISTT | More detail | |
| Raksystems insinritoimisto Oy | Finland | https://www.raksystems.fi | FISTT | More detail |
| Ramboll Finland Oy | Finland | https://www.ramboll.fi | FISTT | More detail |
| Rangedale Rehabilitations & Renewals Pty Ltd | Australia | https://www.rangedale.com.au | ASTT | More detail |
| Ranger Contracting Inc | United States | https://ranger-contracting.com/ | NASTT | More detail |
| RASA Industries,LTD. | Japan | http://www.rasa.co.jp/ | JSTT | More detail |
| Rausch Electronics USA, LLC | United States | https://rauschusa.com | NASTT | More detail |
| Rausch GmbH | Germany | GSTT | More detail | |
| Ravago NZ Ltd | New Zealand | ASTT | More detail | |
| RBM Plumbing and Drainage Pty Ltd | Australia | ASTT | More detail | |
| RBS Rohrbau-Schweisstechnik GmbH | Austria | AATT | More detail | |
| Re-Tec | United Kingdom | UKSTT | More detail | |
| RE4MGlobal Oy | Finland | https://www.re4mglobal.com | FISTT | More detail |
| Reduct NV | België | https://www.reduct.net | NSTT | More detail |
| REDYCO S.A.S. | Colombia | LAMSTT | More detail | |
| REHACANA | France | FSTT | More detail | |
| REKONSTRUKCE POTRUBI-REPO, a.s. | Czech Republic | CZSTT | More detail | |
| Reline America LLC | United States | https://relineamerica.com | NASTT | More detail |
| Reline Europe | United Kingdom | UKSTT | More detail | |
| RELINE EUROPE AG | Germany | FSTT | More detail | |
| Relineeurope AG | Germany | IATT | More detail | |
| RELINEEUROPE GmbH | Germany | GSTT | More detail | |
| RelineEurope GmbH | Alemania | IBSTT | More detail | |
| Relining Advies | Nederland | https://www.reliningadvies.nl | NSTT | More detail |
| Relining Group Oy | Finland | https://www.relininggroup.com | FISTT | More detail |
| Relino Pipe Oy | Finland | https://www.relino.fi | FISTT | More detail |
| Remondis Dusseldorp Rioolservice BV | Nederland | https://www.remondisnederland.nl | NSTT | More detail |
| Renos Oy | Finland | https://www.renos.fi | FISTT | More detail |
| Renos OY | Finland | https://renos.fi/en/ | UKSTT | More detail |
| Renotec Group | Belgium | https://www.renotec.be | NSTT | More detail |
| RePipe Engenharia | Brazil | ABRATT | More detail | |
| RESTITUBO OBRAS Y SERVICIOS, s.l. | Spain | IBSTT | More detail | |
| RETELIT | Italy | IATT | More detail | |
| RHO INGENIEROS S.A.S. | Colombia | https://www.rhoingenieros.com | LAMSTT | More detail |
| RHS Controls Recursos Hidricos e Saneamento LTDA | Brazil | ABRATT | More detail | |
| RICE-GRTgaz | France | FSTT | More detail | |
| Ridge Tool Europe N.V. (RIDGID) | Belgium | https://www.ridgid.com | WORLD | More detail |
| RIEGOS PROGRAMADOS S.L. | Spain | IBSTT | More detail | |
| Riihimen Vesi | Finland | https://riihimaenvesi.fi | FISTT | More detail |
| RioolABC | Netherlands | https://www.rioolabc.com | NSTT | More detail |
| Risanamento Fognature Srl | Italy | IATT | More detail | |
| Ritec Rohr-Inspektionstechnik GmbH | Germany | GSTT | More detail | |
| RJN Group, Inc. - Corporate Headquarters | United States | https://www.rjn.com | NASTT | More detail |
| Rob Carr Pty Ltd | Australia | http://www.robcarr.com.au | ASTT | More detail |
| Robert B. Somerville Co. Limited - Western Head Office | Canada | https://www.rbsomerville.com/ | NASTT | More detail |
| ROCKMAN ASSOCIATION. | Japan | http://www.rockman.gr.jp | JSTT | More detail |
| RODIO SWISSBORING CENTROAMERICA, S.A. | Guatemala | https://www.rodio-swissboring.com | LAMSTT | More detail |
| Roelofs Groep | Nederland | https://www.roelofsgroep.nl | NSTT | More detail |
| Rohrleitungsbauverband e.V. | Germany | GSTT | More detail | |
| Rolkon Trenchles Constr. (Pty) Ltd | South Africa | https://- | SASTT | More detail |
| Rombouts Kunststof Techniek B.V. | Nederland | https://www.romboutskunststoftechniek.nl | NSTT | More detail |
| ROMTEC IND E COM DE PEAS | Brazil | ABRATT | More detail | |
| ROMTEC INDUSTRIA E COMERCIO | Brazil | https://www.romtec.ind.br | LAMSTT | More detail |
| Rose Atkins Rimmer (Infrastructure) Pty Ltd | Australia | https://www.rari.com.au | ASTT | More detail |
| ROTECH srl | Italy | https://www.rotech.it | IATT | More detail |
| RPC Pipe Systems | Australia | https://www.rpcpipesystems.com | ASTT | More detail |
| RS Liner Pte Ltd | Singapore | SGSTT | More detail | |
| RS technik | Swizerland | IATT | More detail | |
| RSM Lining Supplies Global Ltd | United Kingdom | UKSTT | More detail | |
| RSP GmbH | Germany | GSTT | More detail | |
| RSP UK Suction Excavators Ltd | United Kingdom | https://www.rsp-uk.co.uk | UKSTT | More detail |
| RTi Austria GmbH | Austria | AATT | More detail | |
| Ruskon Betoni Oy | Finland | https://www.ruskonbetoni.fi | FISTT | More detail |
| SA Utility Detectors | South Africa | https://- | SASTT | More detail |
| SA Water | Australia | http://www.sawater.com.au | ASTT | More detail |
| Sabesp | Brazil | ABRATT | More detail | |
| SADE COMPAGNIE GENERALE DE TRAVAUX DHYDRAULIQUE | Costa Rica | https://www.sade-cgth.fr/es/costa-rica | LAMSTT | More detail |
| SADE TRAVAUX SPECIAUX | France | FSTT | More detail | |
| SAERTEX multiCom GmbH | Germany | GSTT | More detail | |
| Saertex multiCom GmbH | Germany | IATT | More detail | |
| Saertex Multicom Latam | Brazil | ABRATT | More detail | |
| SAHEN SANEAMENTO LTDA | Brazil | ABRATT | More detail | |
| SAINT GOBAIN SEVA | France | FSTT | More detail | |
| SAINT-GOBAIN PAM CZ s.r.o. | Czech Republic | CZSTT | More detail | |
| Saint-Gobain PAM Finland Oy | Finland | https://www.pamline.fi | FISTT | More detail |
| Saint-Gobain PAM Italia S.p.A. | Italy | IATT | More detail | |
| Saint-Gobain Pipe Systems B.V. | Nederland | https://www.sgps.nl | NSTT | More detail |
| SAK Construction LLC | United States | https://www.sakcon.com | NASTT | More detail |
| Sam Lain Equipemnt Services Pte Ltd | Singapore | SGSTT | More detail | |
| SANCCOL-SANEAMENTO, CONSTRUO E COMRCIO | Brazil | ABRATT | More detail | |
| Sandro Greco srl | Italy | IATT | More detail | |
| Sanecon Sociedade Tecnica Civil Ltda | Brazil | ABRATT | More detail | |
| Sanejets Engenharia Civil e Saneamento Eireli | Brazil | ABRATT | More detail | |
| Sanevale Servios Basicos Ltda | Brazil | ABRATT | More detail | |
| Sanivar | United Kingdom | https://www.sanivar.co.uk | UKSTT | More detail |
| Sankigiken Kogyo Co.,Ltd. | Japan | http://www.sankigiken.com/ | JSTT | More detail |
| Sansui-Consultant Co.,Ltd. | Japan | http://www.3wcon.co.jp/ | JSTT | More detail |
| Sanwakizai.co.,ltd. | Japan | http://www.sanwakizai.co.jp | JSTT | More detail |
| SAPI SRL | Italy | IATT | More detail | |
| SASTTI Joint Venture | Australia | ASTT | More detail | |
| SBP S.A.C. | Peru | https://www.soletanche-bachy.pe | LAMSTT | More detail |
| Schauenburg MAB | Other | https://schauenburg-mab.com/en/startseite | ASTT | More detail |
| Schauenburg Maschinen- und Anlagen-Bau GmbH | Germany | GSTT | More detail | |
| SCS Consulting Group LTD | Canada | https://scsconsultinggroup.com | NASTT | More detail |
| SD Mafcom - Abadzhiev, Yanakieva & Co. | Bulgaria | BATT | More detail | |
| Sealing Systems, Inc. | United States | https://www.ssisealingsystems.com | NASTT | More detail |
| SEBAK, spol. s r.o. | Czech Republic | CZSTT | More detail | |
| Secretaries | South Africa | https://www.sastt.org.za | SASTT | More detail |
| Seinjoen Vesi | Finland | FISTT | More detail | |
| Sekine Kogyo | Japan | http://www.sekine-yk.co.jp/index.html | JSTT | More detail |
| Sekisui | Ecuador | https://sekisuispr.com/?area=deutsch&lang=en | LAMSTT | More detail |
| Sekisui Asia Pipe Solutions Pte Ltd (SAPS) | Singapore | SGSTT | More detail | |
| SEKISUI CHEMICAL CO., LTD. | Japan | http://www.sekisui.co.jp/ | JSTT | More detail |
| SEKISUI Rib Loc Australia Pty Ltd | Australia | http://www.sekisuispr.com | ASTT | More detail |
| SEKISUI SPR Americas, LLC | United States | https://sekisuispra.com/ | NASTT | More detail |
| SENSE HDD llc | Russia | GSTT | More detail | |
| SENSE HDD LLC | Russian Federation | https://www.sense-hdd.ru | CSTT | More detail |
| Sentyabr | Russian Federation | http://s-gnb.ru/ | RSTT | More detail |
| SEQ Trenchless | Australia | ASTT | More detail | |
| SEREHA | France | FSTT | More detail | |
| Sergio Nogueira San terraplanagem Ltda | Brazil | ABRATT | More detail | |
| SERTORI | Italy | IATT | More detail | |
| SERVEO SERVICIOS, S.A. | Spain | IBSTT | More detail | |
| SERVICIO DE REHABILITACION INDUSTRIAL CIPP CHILE S.A. | Chile | https://www.cipp.cl | LAMSTT | More detail |
| Several Oy | Finland | FISTT | More detail | |
| Severomoravske vodovody a kanalizace Ostrava a.s. | Czech Republic | CZSTT | More detail | |
| Sewage Pipe Renewal Method | Japan | http://www.spr.gr.jp/ | JSTT | More detail |
| Sewage-Maintenance Co-operation | Japan | http://www.gesui-mente.or.jp | JSTT | More detail |
| SewCon Kuikka Oy | Finland | http://www.sewcon.fi/ | FISTT | More detail |
| Sewer Equipment Company (Aust) | Australia | ASTT | More detail | |
| SEWERTRONICS ZPZOO | Poland | https://www.sewertronics.com | LAMSTT | More detail |
| SG INGENIERIA EN DUCTOS S.A. ESP | Colombia | https://www.sgingenieriaenductos.com | LAMSTT | More detail |
| SH-superMethod | Japan | http://www.sh-koho.com/ | JSTT | More detail |
| Shanghai Construction Group (Canada) Corporation | Canada | https://www.scg.com.cn | NASTT | More detail |
| SHANGHAI FANTASTIC EQUIPMENT CO.LTD | China | http://www.fantasticequipment.com | CSTT | More detail |
| Shanghai Kanekura Machinery Engineering Co.,Ltd. | China | CSTT | More detail | |
| Sherwin-Williams | United States | https://www.sherwin-williams.com/ | NASTT | More detail |
| SHIMADA CONSTRUCTION Co., Ltd. | Japan | https://www.shimada-kk.com/ | JSTT | More detail |
| Shin nihon sekkei Co.,Ltd. | Japan | http://www.sns.co.jp | JSTT | More detail |
| Shintoku Kogyo Co.,Ltd. | Japan | http://shintoku.net/index.html | JSTT | More detail |
| Shizuoka-ken sewer research association | Japan | http://shizuokagesuiken.com/ | JSTT | More detail |
| SIAAP - DGT | France | FSTT | More detail | |
| Sika Australia | Australia | https://www.sika.com.au | ASTT | More detail |
| Silcon Drilling Servicos e Engenharia Ltda | Brazil | ABRATT | More detail | |
| SIMAM S.A. E.S.P. | Colombia | https://www.simam.co | LAMSTT | More detail |
| Simex srl | Italy | IATT | More detail | |
| SINTEC 3D srl | Italy | https://www.sintec3d.it | IATT | More detail |
| SINZATEC CANALIZACIONES S.L. | Spain | IBSTT | More detail | |
| Sipoon Vesi | Finland | FISTT | More detail | |
| SISTEMAS DE PERFORACIN S.L. | Spain | IBSTT | More detail | |
| SISTEMAS URBANOS ENGENHARIA | Brazil | ABRATT | More detail | |
| SITE spa | Italy | IATT | More detail | |
| SiteTec BV | Nederland | https://www.sitetec.nl | NSTT | More detail |
| Sitowise Oy | Finland | FISTT | More detail | |
| SMCE FORAGE & TUNNEL | France | FSTT | More detail | |
| SMCE REHA | France | FSTT | More detail | |
| SMEC South Africa (Pty) Ltd | South Africa | https://- | SASTT | More detail |
| Smet-Tunnelling N.V. | België | https://www.smetboring.be | NSTT | More detail |
| Smythe Contractors Limited | New Zealand | http://www.smythecon.co.nz | ASTT | More detail |
| Snam rete gas | Italy | IATT | More detail | |
| SNCF - Dpt. des ouvrages d'art | France | FSTT | More detail | |
| SO.IN.G. Strutture e Ambiente S.r.l. | Italy | IATT | More detail | |
| Societ Del Gres Spa | Italy | https://www.gres.it | IATT | More detail |
| SOLETANCHE BACHY COLOMBIA - PREFA | Colombia | https://www.soletanche-bachy.com.co | LAMSTT | More detail |
| Sondeq Industria de Sondas e Equipamentos Ltda | Brazil | ABRATT | More detail | |
| SONNTAG Baugesellschaft mbH & Co. KG | Germany | GSTT | More detail | |
| SORIGUE | Spain | IBSTT | More detail | |
| Source One Environmental Ltd | United Kingdom | UKSTT | More detail | |
| Special Pipeline Services Limited | United Kingdom | https://www.conroysgroup.com | UKSTT | More detail |
| Speeder Kyoukai | Japan | http://www.speeder.co.jp/ | JSTT | More detail |
| Spering micra-systems gmbh | Germany | GSTT | More detail | |
| Spiniello Companies | United States | https://www.spiniello.com/ | NASTT | More detail |
| Spiral Wound Liner, Inc. | United States | https://www.groutscouts.com/ | NASTT | More detail |
| Splender Construction cc | South Africa | https://- | SASTT | More detail |
| SprayRoq Inc. | United States | https://www.sprayroq.com/ | NASTT | More detail |
| Spunton Impianti | Italy | https://www.spuntonimpianit.it | IATT | More detail |
| SSC Underground | United States | https://www.sscunderground.com | NASTT | More detail |
| Staheli Trenchless Consultants | United States | https://www.stahelitrenchless.com/ | NASTT | More detail |
| Stantec | Canada | https://www.stantec.com | NASTT | More detail |
| Stehmeyer + Bischoff Berlin GmbH & Co. KG | Germany | GSTT | More detail | |
| Steinzeug Keramo GmbH | Germany | GSTT | More detail | |
| Steinzeug Keramo NV | België | https://www.steinzeug-keramo.com | NSTT | More detail |
| STEINZEUG KERAMO s.r.o. | Czech Republic | CZSTT | More detail | |
| STEP Oiltools (UK) Ltd | United Kingdom | https://www.stepoiltools.com | UKSTT | More detail |
| Steve Vick International | United Kingdom | https://www.stevevick.com | UKSTT | More detail |
| Stiles Electrical | Australia | https://www.stileselectrical.com.au | ASTT | More detail |
| STLIMA S.L. | Spain | IBSTT | More detail | |
| STPI | France | FSTT | More detail | |
| STRABAG | Australia | https://www.strabag.com.au | ASTT | More detail |
| STRABAG AG Kanaltechnik | Austria | AATT | More detail | |
| Streicher Kanalsysteme GmbH | Germany | GSTT | More detail | |
| Stroitelna Mehanizatsia AD | Bulgaria | https://www.cm-bg.eu | BATT | More detail |
| Strukton Infratechnieken B.V. | Nederland | https://www.struktoninfratechnieken.com | NSTT | More detail |
| SUBTERRA a.s. | Czech Republic | CZSTT | More detail | |
| SDPACK Verpackungen GmbH & Co. KG | Germany | GSTT | More detail | |
| SUEZ EAU FRANCE | France | FSTT | More detail | |
| Sujutek Oy | Finland | https://www.sujutek.fi | FISTT | More detail |
| Sumiyoshi Manufacturing Co.,Ltd. | Japan | http://www.sumiyoshiseisakusyo.co.jp/ | JSTT | More detail |
| Sunbelt Rentals, Inc. | United States | https://www.sunbeltrentals.com | NASTT | More detail |
| Sunshield Inc. | Japan | http://www.sunshield.co.jp | JSTT | More detail |
| Suomen Alitustekniikka Oy | Finland | FISTT | More detail | |
| Suomen Putkisto Palvelu Oy | Finland | https://www.sppoy.com | FISTT | More detail |
| Suomen Putkiuudistus Oy | Finland | https://putkiuudistus.fi | FISTT | More detail |
| Suomen ympristopisto SYKLI | Finland | FISTT | More detail | |
| Superior Quality Engineering & Technologies 8 (Pty) Ltd | South Africa | SASTT | More detail | |
| Sweco | Finland | https://www.sweco.fi | FISTT | More detail |
| Sweco Nederland b.v. | Nederland | https://www.sweco.nl | NSTT | More detail |
| Swietelsky-Faber GmbH | Germany | GSTT | More detail | |
| SWIETELSKY-FABER Kanalsanierung GmbH | Austria | AATT | More detail | |
| SWP-SYSTEMS GmbH | Germany | GSTT | More detail | |
| SWPCOL S.A.S. | Colombia | LAMSTT | More detail | |
| Sydney Water | Australia | ASTT | More detail | |
| Syntech Engineers Pte Ltd | Singapore | SGSTT | More detail | |
| Synthotech | United Kingdom | UKSTT | More detail | |
| SYSTEM ASSESSORIA INSPEO E CONTROLE DE QUALIDADE | Brazil | ABRATT | More detail | |
| SYSTEM FLUIDS IND COM LTDA. | Brazil | ABRATT | More detail | |
| Systra Holdings Pty Ltd | Australia | http://www.bamser.com.au | ASTT | More detail |
| T.A. Drilling (Sales) Ltd | United Kingdom | UKSTT | More detail | |
| T.EN Italy Solutions S.p.A. | Italy | https://www.technip.com | IATT | More detail |
| Taiko Kensetsu Co.,Ltd. | Japan | http://www.taikou-k.co.jp/ | JSTT | More detail |
| TAISEI KIKO Co., ltd. | Japan | http://www.taiseikiko.com | JSTT | More detail |
| Takachiho Sangyo Co.,Ltd. | Japan | http://www.takachiho-sc.co.jp/ | JSTT | More detail |
| TAKENAKA CIVIL ENGINEERING & CONSTRUCTION CO., LTD. | Japan | http://www.takenaka-doboku.co.jp/ | JSTT | More detail |
| TALPA-RPF, s.r.o. | Czech Republic | CZSTT | More detail | |
| Tampereen Vesi | Finland | http://www.tampere.fi/vesi.html | FISTT | More detail |
| tandler.com GmbH | Germany | GSTT | More detail | |
| Tanner Pacific, Inc. | United States | https://www.tannerpacific.com/ | NASTT | More detail |
| Tasyapi Insaat A.S. | Turkey | https://www.tasyapi.com.tr | TSITT | More detail |
| TBM Endustri Otomasyon Ltd | Turkey | https://www.tbmendustri.com | TSITT | More detail |
| TDC INTERNATIONAL AG | Switzerland | GSTT | More detail | |
| TDC International AG | Switzerland | IATT | More detail | |
| TDG Environmental (NZ) | New Zealand | https://www.hydrotech.co.nz/reline | ASTT | More detail |
| TDM Pipeline Solutions Pty Ltd | Australia | https://tdmps.com.au | ASTT | More detail |
| Techfem Spa | Italy | IATT | More detail | |
| Technische Betriebe Solingen | Germany | GSTT | More detail | |
| TECHNODRILL INC. | Japan | http://www.technoj.com | JSTT | More detail |
| TECNODUCTOS LTDA | Colombia | https://www.tecnoductos.com.co | LAMSTT | More detail |
| Teeuw & Vogel | Nederland | https://www.teeuwenvogel.nl | NSTT | More detail |
| TEKKEN CORPORATION | Japan | https://www.tekken.co.jp/ | JSTT | More detail |
| TEKNIK DATASAAB SDN BHD | Malaysia | https://www.tds.com.my/portal/ | MATT | More detail |
| TEKNO DAT S.A.C. | Peru | https://www.teknodat.pe | LAMSTT | More detail |
| TEKNO DAT S.A.C. | Lima Perú | IBSTT | More detail | |
| Telecom Italia SpA | Italy | IATT | More detail | |
| TELEREP FRANCE | France | FSTT | More detail | |
| TEPCO Power Grid, Inc. | Japan | https://www.tepco.co.jp/index-j.html | JSTT | More detail |
| TERIDEAL-SEIRS TP | France | FSTT | More detail | |
| Terra Solutions Ltd | United Kingdom | UKSTT | More detail | |
| Terra-jet Kyoukai | Japan | http://www3.ocn.ne.jp/~terrajet/index.html | JSTT | More detail |
| Terracon | United States | https://www.terracon.com | NASTT | More detail |
| Terrajack (Pty)Ltd | South Africa | https://- | SASTT | More detail |
| TERRASOL | France | FSTT | More detail | |
| Terrat AS / Oy | Estonia | https://www.terrat.ee/fi | FISTT | More detail |
| Tesmec spa | Italy | https://www.tesmec.com | IATT | More detail |
| TESZA INGENIERIA SAS | Colombia | https://www.teszaingenieria.com | LAMSTT | More detail |
| Texel Technical Materials, Inc. | Canada | https://texel.ca | NASTT | More detail |
| The Crossing Company | The Crossing Group | Canada | https://www.crossinggroup.com/the-crossing-company/ | NASTT | More detail |
| the Fourth Branch of China Petroleum Pipeline Bureau Engineering Co., Ltd. | China | http://cpp.cnpc.com.cn/ | CSTT | More detail |
| The Hallen Construction Company, Inc. | United States | https://www.hallen.com | NASTT | More detail |
| The JDM Joint Venture Group | South Africa | https://- | SASTT | More detail |
| The Strong Company, Inc. | United States | https://www.strongseal.com/ | NASTT | More detail |
| The Subterra System Society of Japan. | Japan | http://www.subterra.jp/about_subterra/index.htm | JSTT | More detail |
| The Tunneling Company | The Crossing Group | Canada | https://www.crossinggroup.com/the-tunneling-company/ | NASTT | More detail |
| Thompson Pipe Group | United States | https://thompsonpipegroup.com/ | NASTT | More detail |
| THS B.V., Putrenovaties | Nederland | https://www.ths.nl | NSTT | More detail |
| Tianjin Rilick Engineering Machinery Co.,Ltd. | China | http://www.tjruilike.com | CSTT | More detail |
| Tilson | United States | https://tilsontech.com/ | NASTT | More detail |
| Tiroler Roher srl | Italy | IATT | More detail | |
| Tiroler Rohre GmbH | Austria | AATT | More detail | |
| TK Infra Oy | Finland | FISTT | More detail | |
| TKR-Marketing Oy | Finland | https://www.tkr.fi | FISTT | More detail |
| TOA GROUT KOGYO CO., LTD. | Japan | http://www.toa-g.co.jp | JSTT | More detail |
| TOBISHIMA Corporation | Japan | http://www.tobishima.co.jp/ | JSTT | More detail |
| TOHO GAS CO.,Ltd. | Japan | http://www.tohogas.co.jp/ | JSTT | More detail |
| Tokyo Densetsu Service Co., Ltd | Japan | JSTT | More detail | |
| TOKYO ENGINEERING CONSULTANTS CO.,LTD. | Japan | https://httpｓ://www.tokyoengicon.co.jp/ | JSTT | More detail |
| Tokyo Gas Engineering Solutions Corporation | Japan | https://www.tokyogas-es.co.jp/ | JSTT | More detail |
| TOKYO SANGYO CO.,LTD. | Japan | http://www.tscom.co.jp/ | JSTT | More detail |
| TOLSA, S.A. | Spain | IBSTT | More detail | |
| TOUPEIRA VERDE, Lda. | Lisboa Portugal | IBSTT | More detail | |
| Tracto Technik | Germany | IATT | More detail | |
| TRACTO TECHNIK FRANCE | France | FSTT | More detail | |
| Tracto Technik GmbH & Co KG | Germany | AATT | More detail | |
| Tracto Technik Tracto Technik GmbH & Co KG | Germany | https://tracto.com | NSTT | More detail |
| TRACTO-TECHNIK Australia Pty Ltd | Australia | http://www.tt-asiapacific.com | ASTT | More detail |
| Tracto-Technik GmbH & Co. KG | Germany | GSTT | More detail | |
| TRACTO-TECHNIK GmbH & Co. KG | Bolivia | https://www.tracto.com | LAMSTT | More detail |
| Tracto-Technik UK Ltd | United Kingdom | UKSTT | More detail | |
| Trail Infraestrutura Ltda | Brazil | ABRATT | More detail | |
| TRANSGUA TRANSPORTES DE GUA LTDA | Brazil | ABRATT | More detail | |
| TRAPIL | France | https://www.trapil.com | FSTT | More detail |
| Tratos Cavi SpA | Italy | IATT | More detail | |
| Trelleborg Pipe Seals | United Kingdom | UKSTT | More detail | |
| TRELLEBORG Pipe Seals Duisburg GmbH | Germany | AATT | More detail | |
| Trelleborg Pipe Seals GmbH | Germany | GSTT | More detail | |
| Trelleborg Pipe Seals Milford, Inc. | United States | https://www.trelleborg.com/en/pipe-seals | NASTT | More detail |
| Trelleborg Sealing Profiles Germany GmbH | Germany | GSTT | More detail | |
| Trenchless Advisor Pty Ltd | Australia | http://www.trenchlessadvisor.com.au | ASTT | More detail |
| Trenchless Technology | South Africa | SASTT | More detail | |
| Trenchless Technology (F.E) Pte Ltd | Singapore | SGSTT | More detail | |
| TRGH Vylon Pipe | United States | https://www.vylonpipe.com/ | NASTT | More detail |
| Tri-State Utilities | United States | https://tristateutilities.com | NASTT | More detail |
| TRI/Environmental | United States | https://www.tri-env.com | NASTT | More detail |
| TRY TEK Machine Works Inc. | United States | https://www.trytek.com | NASTT | More detail |
| TST Engineering | Italy | UKSTT | More detail | |
| TST-TRAVAUX SANS TRANCHEES | France | FSTT | More detail | |
| Tsukishima Technology Mentenance Service Co.,Ltd. | Japan | http://www.t-tms.co.jp | JSTT | More detail |
| TT Technologies, Inc. | United States | https://www.tttechnologies.com | NASTT | More detail |
| TU Delft | Nederland | http://geo.citg.tudelft.nl | NSTT | More detail |
| Tuboseal | South Africa | https://- | SASTT | More detail |
| tubus GmbH | Germany | GSTT | More detail | |
| Tubus System Italia srl | Italy | IATT | More detail | |
| Tunnel Service Group GmbH | Germany | GSTT | More detail | |
| Tunnel24 GmbH | Germany | GSTT | More detail | |
| Turun Seudun Puhdistamo Oy | Finland | FISTT | More detail | |
| Turun Vesihuolto Oy | Finland | https://www.turku.fi/vesihuolto | FISTT | More detail |
| U-Tech Engineering Co. Ltd. | Hong Kong | CHKSTT | More detail | |
| UEA Pty Ltd | Australia | ASTT | More detail | |
| UHL Bau | Austria | AATT | More detail | |
| Uhrig Kanaltechnik GmbH | Germany | GSTT | More detail | |
| Uhrig Kanaltechnik GmbH | Germany | AATT | More detail | |
| UIS | United Kingdom | UKSTT | More detail | |
| Ulefos Oy | Finland | https://www.ulefos.fi | FISTT | More detail |
| UNARETI | Italy | IATT | More detail | |
| Unclemole Tonnelling Association | Japan | http://www.unclemole.jp/ | JSTT | More detail |
| Underground City Oy | Finland | FISTT | More detail | |
| Underground Company of Zhejiang Communications Construction Group Co., Ltd. | China | https://www.zjjtgc.com | CSTT | More detail |
| Underground Magnetics Inc. | United States | https://www.undergroundmagnetics.com/ | NASTT | More detail |
| Underground Tools Inc. | United States | https://www.undergroundtools.com/ | NASTT | More detail |
| Uni-Jet Industrial Pipe Services | Canada | https://www.unijet.ca | NASTT | More detail |
| UNICORN ENBI DEISUI SUISHIN KOUHOU KENKYUKAI Co.,Ltd. | Japan | http://www.unicorn-dhes.com/ | JSTT | More detail |
| unicorn kyokai | Japan | http://www.unicorn-kyokai.jp// | JSTT | More detail |
| UNIFORTE AMERICANA ENGENHARIA E CONSTRUTORA LTDA | Brazil | ABRATT | More detail | |
| UNION TEMPORAL J.A. ASOCIADOS S.A. - INVERSIONES OSORIO GONZALEZ S.A. | Colombia | https://www.utjaiog.com.co | LAMSTT | More detail |
| Universal Pipeliine Association (UPA-Group) | Netherlands | https://www.upagroup.com | NSTT | More detail |
| UNIVERSIDAD ESCUELA DE INGENIERIA DE ANTIOQUIA | Colombia | https://www.eia.edu.co | LAMSTT | More detail |
| Uponor Infra Oy | Finland | FISTT | More detail | |
| Urban No-dig Method Association | Japan | http://www.urban-nodig.jp/ | JSTT | More detail |
| UTIC SERVICES SDN BHD | Malaysia | https://www.uticservices.com | MATT | More detail |
| Vaasan Vesi | Finland | FISTT | More detail | |
| VALENTIN TP | France | FSTT | More detail | |
| Van de Beek Gestuurd Boren B.V. | Nederland | https://www.beekbedrijven.nl | NSTT | More detail |
| Van den Heuvel Bedrijven Groep B.V. | Nederland | https://www.heuvelheesch.nl | NSTT | More detail |
| Van der Valk + De Groot BV | Nederland | https://www.valkdegroot.nl | NSTT | More detail |
| Van der Velden Rioleringrenovatietechnieken BV | Nederland | https://www.vandervelden.com | NSTT | More detail |
| Van Gelder Kabel-, Leiding- en Montagewerken BV | Netherlands | https://www.gelder.com | NSTT | More detail |
| Van Voskuilen Woudenberg BV | Netherlands | https://www.voskuilen.nl | NSTT | More detail |
| Van Vulpen B.V. | Nederland | https://www.vanvulpen.eu | NSTT | More detail |
| VCSP RESEAUX FRANCE | France | FSTT | More detail | |
| Vector Magnetics | United States | https://www.vectormagnetics.com/ | NASTT | More detail |
| Vector Magnetics | Other | https://www.vectormagnetics.com/ | ASTT | More detail |
| VEGI s.r.o. | Czech Republic | CZSTT | More detail | |
| Vel Micro Method Association. | Japan | http://www.miclo-mcl.com | JSTT | More detail |
| VEOLIA | Spain | IBSTT | More detail | |
| Veolia | Australia | ASTT | More detail | |
| Vermeer | Spain | IBSTT | More detail | |
| Vermeer Asia Pacific | Japan | http://vermeer.com | JSTT | More detail |
| Vermeer Australia | Australia | http://www.vermeer.com.au | ASTT | More detail |
| Vermeer Corporation | United States | https://VermeerMVS.com | NASTT | More detail |
| Vermeer Equipamentos e Tecnologia Ltda | Brazil | ABRATT | More detail | |
| Vermeer Equipment Suppliers (Pty) Ltd | South Africa | https://- | SASTT | More detail |
| VERMEER FRANCE | France | FSTT | More detail | |
| VERMEER FRANCE | France | FSTT | More detail | |
| Vermeer Italia Srl | Italy | IATT | More detail | |
| Vermeer Tianjin Manufacturing Co.,Ltd. | China | https://www.vermeer.com | CSTT | More detail |
| Vermeer UK | United Kingdom | https://www.vermeer-uk.co.uk | UKSTT | More detail |
| Vertical Horizonz Australia | Australia | https://www.verticalhorizonz.com/au-home | ASTT | More detail |
| Vertiliner GmbH & Co. KG | Germany | GSTT | More detail | |
| Vesikolmio Oy | Finland | https://www.vesikolmio.fi | FISTT | More detail |
| VIADIRECTA CONSTRUCCIONES S.A. | Ecuador | https://www.viadirecta.com.ec | LAMSTT | More detail |
| VIBROPAC | Brazil | ABRATT | More detail | |
| Victoria Drain Services Ltd. | Canada | https://www.victoriadrains.com/ | NASTT | More detail |
| ViK Kardjali Ltd. | Bulgaria | BATT | More detail | |
| ViK Plovdiv Ltd. | Bulgaria | https://www.vik.bg | BATT | More detail |
| ViK Shumen Ltd. | Bulgaria | https://www.vik-shumen.net | BATT | More detail |
| ViK Stara Zagora Ltd. | Bulgaria | BATT | More detail | |
| ViK Yovkovtsi | Bulgaria | BATT | More detail | |
| Vinidex Pty Limited | Australia | http://www.vinidex.com.au | ASTT | More detail |
| VIP-Polymers Ltd | United Kingdom | https://www.vip-polymers.com | UKSTT | More detail |
| Visser & Smit Hanab bv | Nederland | https://www.vshanab.nl | NSTT | More detail |
| VIVAQUA | Belgium | FSTT | More detail | |
| VMT GmbH Gesellschaft fr Vermessungstechnik | Germany | GSTT | More detail | |
| Vodokanal Podol'sk | Russian Federation | https://www.vodokanalpodolsk.ru | RSTT | More detail |
| VODOVODY A KANALIZACE Jablonne nad Orlici a.s. | Czech Republic | CZSTT | More detail | |
| Volker Trenchless Solutions | United Kingdom | UKSTT | More detail | |
| Volta Macchine Srl | Italy | IATT | More detail | |
| vonRoll hydro (deutschland) gmbh & co. kg | Germany | GSTT | More detail | |
| Vortex Companies | United Kingdom | UKSTT | More detail | |
| Vortex Europe GmbH | Germany | GSTT | More detail | |
| Wade Trim | United States | https://www.wadetrim.com/ | NASTT | More detail |
| WARAS MEGAH SDN BHD. | Malaysia | MATT | More detail | |
| Ward & Burke Construction Ltd | United Kingdom | UKSTT | More detail | |
| Warren Environmental Inc. | United States | https://www.warrenenviro.com/ | NASTT | More detail |
| Warren Smith & Partners | Australia | ASTT | More detail | |
| Water & Pipeline Services | United Kingdom | https://WWW.WATERANDPIPELINESERVICES.CO.UK | UKSTT | More detail |
| Water Resources Department, New Taipei City Government | Taiwan | CTSTT | More detail | |
| Watercare Services Ltd | New Zealand | http://www.watercare.co.nz | ASTT | More detail |
| Waterland Detection Engineering Ltd. | Hong Kong | https://www.waterland.com.hk | CHKSTT | More detail |
| Waterline Renewal Technologies, Inc. - Corporate HQ | United States | https://waterlinerenewaltechnologies.com/ | NASTT | More detail |
| Waternet | Nederland | https://www.waternet.nl | NSTT | More detail |
| Waverail BV | Nederland | https://www.fodere.nl | NSTT | More detail |
| Wayss & Freytag Ing.-bau AG, Bereich Tunnelbau | Germany | GSTT | More detail | |
| WBHO Pipelines | South Africa | https://- | SASTT | More detail |
| Wepex Geotechnical (Pty) Ltd | South Africa | SASTT | More detail | |
| Wessex Water | United Kingdom | UKSTT | More detail | |
| WIEDEMANN enviro tec GmbH & Co. KG | Germany | GSTT | More detail | |
| Wiener Betriebs- und Baugesellschaft m.b.H. | Austria | AATT | More detail | |
| Wilmot Pipelining | Australia | https://www.wilmotpipelining.com.au | ASTT | More detail |
| Wilson & Company, Inc. | United States | https://www.wilsonco.com/ | NASTT | More detail |
| Wilsons Pipeline Solutions | Australia | ASTT | More detail | |
| WINDTRE spa | Italy | https://www.windtre.it | IATT | More detail |
| Witteveen & Bos Raadgevende Ingenieurs BV | Nederland | https://www.witteveenbos.nl | NSTT | More detail |
| WOMBAT s.r.o. | Czech Republic | CZSTT | More detail | |
| WRc Plc | United Kingdom | https://www.wrcplc.co.uk | UKSTT | More detail |
| WSP | New Zealand | https://www.wsp.com | ASTT | More detail |
| WSP Consultancy Pte Ltd | Singapore | SGSTT | More detail | |
| WSP Finland Oy | Finland | https://www.wsp.com | FISTT | More detail |
| WSP Nederland BV | Nederland | https://www.wsp.com/nl-NL/ | NSTT | More detail |
| Wuhan Tuozhan Underground Pipeline Engineering Co.,Ltd. | China | CSTT | More detail | |
| Wuxi Double Horse Drilling Tools Co.,Ltd. | China | https://www.wxshuangma.cn | CSTT | More detail |
| Wuxi Lushun Drilling Tools Co.,Ltd | China | http://www.wxlushun.com | CSTT | More detail |
| Wyo-Ben Inc. | United States | https://www.wyoben.com/ | NASTT | More detail |
| XCMG Brasil Industria LTDA | Brazil | ABRATT | More detail | |
| XCMG Xuzhou Xugong Foundation Construction Machinery Co., Ltd. | China | https://www.xcmg.com | CSTT | More detail |
| XIS-engineering | Nederland | https://www.xis-engineering.nl | NSTT | More detail |
| Xylem Dewatering Solutions, Inc. | United States | https://www.xylem.com | NASTT | More detail |
| Xylem Water Solution Suomi Oy | Finland | https://www.xylem.fi | FISTT | More detail |
| YAMADA SHOKAI CO.,LTD. | Japan | http://www.ymax.co.jp/index.html | JSTT | More detail |
| YAMIL SABBAGH CONSTRUCCIONES SAS | Colombia | https://www.ysconstrucciones.com | LAMSTT | More detail |
| YANGZHOU DAWN DRILLING TOOLS CO.,LTD | China | http://www.dawndrill.com | CSTT | More detail |
| Yarra Valley Water | Australia | ASTT | More detail | |
| Yasuda Engineering Co.,Ltd | Japan | http://www.yasuda-eng.co.jp/ | JSTT | More detail |
| Zalobase (Pty) Ltd | South Africa | SASTT | More detail | |
| Zennkoku Joint Pipe Kyoukai | Japan | http://www.w-joint.gr.jp/ | JSTT | More detail |
| ZEPRIS s.r.o. | Czech Republic | CZSTT | More detail | |
| Zhejiang Juntai Environmental Protection Technology Co.Ltd. | China | CSTT | More detail | |
| Zhejiang Juntai Environmental Protection Technology Inc. | China (PR) | CSTT | More detail | |
| ZILPER TRENCHLESS LATAM S.A.S. | Colombia | https://www.zilpertrenchless.com | LAMSTT | More detail |
| ZOZIME SARL | France | FSTT | More detail | |
| Zutari (Pty) Ltd | South Africa | https://www.zutari.com | SASTT | More detail |