Public Water Systems
7,249 active public water systems in CA, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.
| System Name | Location | Population | Violations | PFAS |
|---|---|---|---|---|
| Awa, Ione | Sutter Creek, CA | 7,227 | 22 | Clean |
| City of Winters | Winters, CA | 7,115 | 8 | Detected |
| Los Osos Community Services District | Los Osos, CA | 7,086 | 3 | Detected |
| Lake Arrowhead Csd | Lake Arrowhead, CA | 7,038 | 0 | Detected |
| Santa Ynez River Water Cons. Dist. Id#1 | Santa Ynez, CA | 7,022 | 27 | Clean |
| Cherry Auction | Fresno, CA | 7,000 | 10 | - |
| Peter Pitchess Honor Rancho Detn. Ctr | Castaic, CA | 7,000 | 9 | Detected |
| Arrowhead Regional Medical Center | Colton, CA | 7,000 | 4 | - |
| Golden State WC - Cowan Heights | Anaheim, CA | 6,997 | 1 | Detected |
| Heber Public Utility District | Heber, CA | 6,979 | 51 | Clean |
| Fort Bragg, City Of | Fort Bragg, CA | 6,919 | 12 | Clean |
| Nevada ID - Lake of Pines | Grass Valley, CA | 6,870 | 0 | Clean |
| Nevada ID - North Auburn | Grass Valley, CA | 6,870 | 0 | Clean |
| Ojai Water System | Oak View, CA | 6,801 | 4 | Clean |
| Caltrans, Cactus City Rest Area | San Bernardino, CA | 6,800 | 26 | - |
| Beale Air Force Base | Beale Afb, CA | 6,785 | 25 | Clean |
| Foresthill Public Utility Dist | Foresthill, CA | 6,782 | 2 | Clean |
| Nuevo Water Company | Nuevo, CA | 6,733 | 16 | Detected |
| Joshua Basin Water District | Joshua Tree, CA | 6,640 | 9 | Clean |
| China Lake Naval Air Weapons Station | China Lake, CA | 6,600 | 32 | Clean |
| Psmcsd - Pajaro | Royal Oaks, CA | 6,500 | 5 | Clean |
| Lake of the Springs | Oregon House, CA | 6,500 | 1 | Clean |
| Madera Valley Water Company | Madera, CA | 6,494 | 15 | Clean |
| YMCA Camp Whittle | Fawnskin, CA | 6,466 | 15 | - |
| City of Colusa | Colusa, CA | 6,447 | 8 | Clean |
| Los Angeles Cwwd 36-Val Verde | Alhambra, CA | 6,376 | 2 | Clean |
| Holtville, City Of | Holtville, CA | 6,355 | 56 | Clean |
| Maywood Mutual Water Co. #2 | Maywood, CA | 6,349 | 0 | Detected |
| Helendale Community Service District | Helendale, CA | 6,347 | 51 | Detected |
| North Tahoe PUD - Main | Tahoe Vista, CA | 6,321 | 12 | Clean |
| Calaveras PUD | San Andreas, CA | 6,286 | 18 | Clean |
| Purissima Hills Water District | Los Altos Hills, CA | 6,245 | 17 | Clean |
| Hidden Valley Lake Csd | Hidden Valley Lake, CA | 6,235 | 2 | Clean |
| Northrop Grumman Corp. | Palmdale, CA | 6,214 | 19 | Detected |
| Golden State Water Co - Apple Vly South | Apple Valley, CA | 6,208 | 1 | Clean |
| Cutler PUD | Cutler, CA | 6,200 | 45 | Clean |
| Willits, City Of | Willits, CA | 6,175 | 28 | Clean |
| City of Industry Waterworks Systems | La Puente, CA | 6,158 | 7 | Clean |
| Cal Trans Erreca Rest Area | Stockton, CA | 6,150 | 8 | - |
| Solvang Water Division | Solvang, CA | 6,126 | 38 | Detected |
| City of Gustine | Gustine, CA | 6,110 | 21 | Clean |
| Ventura River Water District | Ojai, CA | 6,100 | 10 | Clean |
| Dinuba, City Of | Dinuba, CA | 6,081 | 36 | Clean |
| Montara Water and Sanitary District | Montara, CA | 6,078 | 11 | Clean |
| Maywood Mutual Water Co. #3 | Maywood, CA | 6,059 | 10 | Detected |
| Soledad Mission WS | Soledad, CA | 6,000 | 70 | - |
| Lake Almanor Country Club MWC | Lake Almanor, CA | 6,000 | 6 | Clean |
| Caltrans, Whitewater Rest Area | San Bernardino, CA | 6,000 | 22 | - |
| Sweetwater Springs Cwd - Guerneville | Guerneville, CA | 6,000 | 7 | Clean |
| Bellflower Municipal Water System | Rosemead, CA | 5,999 | 8 | Detected |