- Aecom
- Aquatech International LLC
- WS Atkins Plc
- Black & Veatch Holding Company
- Dow
- DuPont
- Evoqua Water Technologies
- Ecolab Inc.
- IDE Technologies
- ITT Corporation
- Kurita Water Industries Ltd
- Louis Berger
- Mott Macdonald
- Organo Corporation
- Ovivo
- Paques
- Remondis
- Schlumberger Limited
- Suez
- Tetra Tech Inc.
- Veolia Water Solutions & Technologies