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 |
| Stoco Mutual Water Company | Bakersfield, CA | 85 | 62 | - |
| Kern Ridge Growers | Arvin, CA | 85 | 43 | - |
| Mid - Bagby Recreation Area | Snelling, CA | 85 | 8 | - |
| Driscoll Strawberry WS | Watsonville, CA | 85 | 43 | - |
| South Yuba Campground | El Dorado Hills, CA | 85 | 4 | - |
| Truckee-Donner PUD - Hirschdale | Truckee, CA | 85 | 2 | - |
| Liberty Park Water Association | Huntington Beach, CA | 85 | 19 | - |
| White's Steel, Inc. | Thermal, CA | 85 | 110 | - |
| Idyllwild Pines Camp | Idyllwild, CA | 85 | 7 | - |
| Cozad Water System | Stockton, CA | 85 | 6 | - |
| Bassi Ranch Mutual Water Co. | Grover Beach, CA | 85 | 11 | - |
| Zoo Med-Winterhaven | San Luis Obispo, CA | 85 | 2 | - |
| Resource Center | Goleta, CA | 85 | 2 | - |
| Lone Tree Mobile Home Park | Anderson, CA | 85 | 10 | - |
| Creekside Mobilehome Park | Sacramento, CA | 85 | 2 | - |
| Modern Village MWC | Red Bluff, CA | 85 | 22 | - |
| Lassen View Water District | Red Bluff, CA | 85 | 20 | - |
| Yosemite Vista Estates | Groveland, CA | 85 | 5 | - |
| Mjusd Dobbins School | Marysville, CA | 85 | 12 | - |
| Mt Ralston Properties Assc Inc | San Ramon, CA | 84 | 32 | - |
| Ponderosa RV Park | Fresno, CA | 84 | 17 | - |
| Eagle Nest Homeowners' Association | Susanville, CA | 84 | 18 | - |
| MD 36 Eastin Arcola | Madera, CA | 84 | 30 | - |
| Orr Springs Resort | Ukiah, CA | 84 | 15 | - |
| Sierra East HOA | Coleville, CA | 84 | 90 | - |
| Lake San Antonio MHP WS | San Jose, CA | 84 | 5 | - |
| Davis Estates | Huntington Beach, CA | 84 | 0 | - |
| Golden Hills Mutual Water Co | Loomis, CA | 84 | 33 | - |
| Fallon Road Labor Housing | King City, CA | 84 | 33 | - |
| Chamisal MWC | Adelanto, CA | 84 | 38 | - |
| Wynola Farms Water District | Julian, CA | 84 | 9 | - |
| Ken Mar Gardens | Arroyo Grande, CA | 84 | 45 | - |
| Saralee's Vineyard and Tasting Room | Santa Rosa, CA | 84 | 0 | - |
| Panorama Park Fire Pro Co | Posey, CA | 84 | 18 | - |
| Triassic Legacy Vineyards Water System | Tehachapi, CA | 83 | 2 | - |
| Sunrise Shore Mutual Water Company | Lower Lake, CA | 83 | 39 | - |
| Ripperdan Community Day School | Madera, CA | 83 | 17 | - |
| Cal Am - Coarsegold | Sacramento, CA | 83 | 17 | - |
| Cdf - Oak Glen Conservation Camp | Yucaipa, CA | 83 | 7 | - |
| Sj County-Redwood School | Stockton, CA | 83 | 8 | - |
| Alameda County Fairgrounds | Pleasanton, CA | 82 | 20 | - |
| Ebrpd Round Valley Water System | Oakland, CA | 82 | 0 | - |
| New Horizons Mobile/RV Park | Redmond, CA | 82 | 40 | - |
| Cc Farms, LLC. | Livermore, CA | 82 | 71 | - |
| Lake of the Woods Mobile Village | Lake of the Woods, CA | 82 | 40 | - |
| Desert Breeze Mobile Home Estates | Encino, CA | 82 | 66 | - |
| Chowchilla Rec Area Eastman Lake | Raymond, CA | 82 | 4 | - |
| Tomales Tin Building | Tomales, CA | 82 | 6 | - |
| Jacks Ranch-Reservation Road WS | Salinas, CA | 82 | 2 | - |
| Floricultura Pacific WS | Salinas, CA | 82 | 6 | - |