Geosynthetic Institute

GSI Members

GSI Members by Focus Group

(As of August, 2025)

Government Agencies	Owner/Operator	Consultant and Test labs		Resin Producers	Installers/Contractors
U.S. EPA U.S. FHwA U.S. Corps Engrs. GSI-Korea BTRA-GSI-India	Waste Mgmt., Inc. Republic Services Inova GS’s Duke Energy	WSP TRI CEC Geocomp CTI & Assoc.	Advance Earth Sciences Weaver Consultants Jones Edmunds Jones & Wagener	Chevron Phillips Dow Inc.	SOLMAX CARPI InterGEO Services Aquatan Afitex-Texel CCS Liners Layfield Group Chesapeake Containment Systems Jet Filter System + (GSI manufacturers)

Geomembrane		Geotextile	Geocomposites	Geogrid	GCL
NAUE SOLMAX AGRU ATARFIL Viaflex Carlisle Iko-Axter SAS EPI Cooley Inc.	Aquatan Watershed Geosynthetics Seaman Corporation SKAPS Layfield Group Engepol Geossintéticos Chesapeake Containment Systems Doha Waterproof Factory Azul Pack Filmes and Embalagans Ltda.	SOLMAX TenCate Huesker Propex GeoSolutions NAUE Afitex-Texel Maccaferri Magnera AGRU InterGEO Services SKAPS	SOLMAX TenCate Tensar AGRU NAUE Aquatan Afitex-Texel Maccaferri Magnera American Wick Drain Inova GS’s SKAPS Concrete Canvas	Tensar TenCate Huesker NAUE Propex GeoSolutions Maccaferri	SOLMAX CETCO-Minerals Technology Huesker NAUE AGRU InterGEO Services Concrete Canvas

Associate Members

Delaware Solid Waste Authority
Nebraska DEE
Maine DEP
New York DOT
California Water Res. Control Board
New Jersey DEP
Pennsylvania DEP
Florida DEP
U.S. Bureau of Reclamation
Michigan EGLE
Environment Agency of United Kingdom
Florida DOT
Virginia DEQ
Massachusetts DEP
Dept. Water Affairs - So. Africa
Pennsylvania Dept. of Transportation