| Advantek Waste Management Services/GeoEnvironment Technologies |
| AECOM |
| Alan Plummer Associates, Inc. |
| American Infrastructure Holdings |
| Aquasight |
| Arcadis |
| Atkins |
| Biobot Analytics, Inc. |
| Black & Veatch Corporation |
| Blue Cypress Consulting, LLC |
| Brown and Caldwell |
| Burns & McDonnell Engineering Company, Inc. |
| Carollo Engineers, Inc. |
| Causey Consulting |
| CDM Smith |
| Clyde Wilber LLC |
| Core Consulting Group, LLC |
| D & B Engineers and Architects, P.C. |
| EMA, Inc. |
| EPC Consultants, Inc. |
| Galardi Rothstein Group |
| Geosyntec Consultants |
| Greeley and Hansen LLC |
| Gresham Smith |
| Hazen and Sawyer |
| HDR Engineering, Inc. |
| InSinkErator |
| Isle Utilities |
| Jacobs |
| Kennedy/Jenks Consultants |
| Larry Walker Associates, Inc. |
| LimnoTech |
| Lystek International Corporation |
| MMO Consulting |
| Moonshot Missions |
| Ostara Technologies, Inc. |
| Ovivo USA, LLC |
| R2O Consulting |
| Raftelis |
| Resource Environmental Solutions |
| Shield Engineering, Inc. |
| SmartCover Systems |
| Stantec |
| Stepwell Water Consulting |
| Suez |
| Synagro Technologies, Inc. |
| Tetra Tech, Inc. |
| Veolia North America |
| Wade-Trim Associates, Inc. |
| Waste Management |
| Westin Technology Solutions, LLC |
| WSP USA |
| XPV Water Partners |
| Xylem Inc. |