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 |
| China Lake Acres Mutual Water Company | Inyokern, CA | 198 | 12 | - |
| Western Skies Mobile Home Park | Lancaster, CA | 198 | 7 | - |
| Sterling Mutual Water Company | El Monte, CA | 198 | 17 | - |
| Colonial Oak WC Inc | Salinas, CA | 198 | 66 | - |
| Alpine Village | Romoland, CA | 198 | 75 | - |
| Crazzy's Wasewagan Camp | Angelus Oaks, CA | 198 | 26 | - |
| Fcwwd 40 - Shaver Springs | Fresno, CA | 196 | 89 | - |
| Long Valley Charter School | Doyle, CA | 196 | 2 | - |
| Usfws San Luis Nwr Complex | Los Banos, CA | 196 | 0 | - |
| Stonegate Mobile Home Park | Los Angeles, CA | 196 | 12 | - |
| Reeds Creek School | Red Bluff, CA | 196 | 3 | - |
| Saticoy Country Club-City of Ventura | Ventura, CA | 196 | 0 | - |
| Silver Dollar Fairgrounds | Chico, CA | 195 | 14 | - |
| Allen Road Mutual Water System | Bakersfield, CA | 195 | 25 | - |
| Hitchin Lucerne Inc | Lucerne Valley, CA | 195 | 4 | - |
| Tid/ la Grange Water System | Turlock, CA | 195 | 34 | - |
| Alpine Acres Mutual Water Co | Soulsbyville, CA | 195 | 18 | - |
| Mpwd-Coulterville CSA 1 | Mariposa, CA | 193 | 23 | - |
| Ventana Big Sur Inn WS | Big Sur, CA | 193 | 19 | - |
| Palomar Mountain Mutual Water Co. | Bonita, CA | 193 | 33 | - |
| Roaring Camp Railroad Inc | Felton, CA | 193 | 35 | - |
| Auberry Lds Church | Tulare, CA | 192 | 4 | - |
| Western MWD (ID a - Rainbow) | Riverside, CA | 192 | 0 | - |
| Pescadero High School | Pescadero, CA | 192 | 14 | - |
| Accelerated Charter High School | Tulare, CA | 192 | 19 | - |
| Las Flores Water Works | Gerber, CA | 191 | 25 | - |
| U.c. Kearney Field Station | Parlier, CA | 190 | 19 | - |
| Fresno Clovis Rwrf Water System | Fresno, CA | 190 | 4 | - |
| Shepherd of the Hills - Tehachapi | Tehachapi, CA | 190 | 0 | - |
| Revol Greens | Tehachapi, CA | 190 | 0 | - |
| Rio Mesa Golf Inc | Fresno, CA | 190 | 9 | - |
| Placer Cwa - Applegate | Auburn, CA | 190 | 0 | - |
| Santa Cruz Waldorf School | Santa Cruz, CA | 190 | 18 | - |
| Bridge Camp | Redding, CA | 190 | 2 | - |
| Camp Jack Hazard | Modesto, CA | 190 | 34 | - |
| Awa la Mel Heights #3 | Sutter Creek, CA | 188 | 13 | - |
| Park West Mutual Water Company | Bishop, CA | 188 | 2 | - |
| Caspar South Service Company | Santa Rosa, CA | 188 | 13 | - |
| Silver Oak Wine Cellars | Healdsburg, CA | 188 | 10 | - |
| Shamrock Mobile Home Park | Santa Rosa, CA | 188 | 64 | - |
| Monte Vista Farming | Denair, CA | 188 | 9 | - |
| Ken's Shopping Center | Auberry, CA | 187 | 3 | - |
| Fern Grove Water Club | Scotts Valley, CA | 187 | 20 | - |
| Woodridge Mutual Water Co | Shingletown, CA | 187 | 10 | - |
| Round Valley High School | Covelo, CA | 186 | 35 | - |
| Crystal Lake Property Owners | Yermo, CA | 186 | 4 | - |
| Csp Caswell State Park | Columbia, CA | 186 | 7 | - |
| Ellwood Mutual Water Company | Santa Barbara, CA | 186 | 11 | - |
| Campbell Soup Dixon | Dixon, CA | 186 | 3 | - |
| Monterey Park Tract Csd | Ceres, CA | 186 | 124 | - |