| City of Calgary, Alberta, Canada |
Cinco Municipal Utility District #1 |
| CA State Water Resources Control Board |
City of Chicago, Illinois |
| California Urban Water Conservation Council |
Chicago Faucets |
| California Water Conservation Company |
Chicago Metropolitan Agency for Planning |
| California Water Service Company |
City of Clayton, Georgia |
| Canadian Water & Wastewater Association |
Coalition for Water Security |
| Capital Regional District |
Cobb County Water System |
| Caroma USA |
City of College Station, Texas |
| Cascade Water Alliance |
Colorado Springs Utilities |
| Castleman & Sons Plumbing, Inc. |
Connecticut Water |
| Center for Neighborhood Technology |
Conserve Florida Water Clearinghouse |
| Central Basin Municipal Water District |
Cypress Forest Public Utility District |
| CH2M Hill |
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| City of Charlottesville, Virginia |
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