- AECOM
- Aquatech International LLC
- Black & Veatch Holding Company
- Doosan Heavy Industries & Construction
- DuPont de Nemours Inc.
- Ecolab
- Evoqua Water Technologies LLC
- IDE Technologies
- ITT INC.
- Kurita Water Industries Ltd
- Louis Berger
- Mott Macdonald
- Organo Corporation
- Ovivo
- Paques
- REMONDIS SE & Co. KG
- Schlumberger Limited
- Severn Trent Water
- Siemens
- Solenis
- SUEZ
- Tetra Tech Inc.
- Veolia