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 |
| The Mercantile | Kelseyville, CA | 28 | 0 | - |
| Lang Ranch Shopping Center | La Crescenta, CA | 28 | 7 | - |
| Rollin Wagon Trailer Club | Oakhurst, CA | 28 | 19 | - |
| North Wawona Park Mutual (a System) | Oakhurst, CA | 28 | 4 | - |
| Olivares Farms Water System | Delhi, CA | 28 | 42 | - |
| Rosehart Industrial Park WS | Salinas, CA | 28 | 19 | - |
| Somerston Winery | St. Helena, CA | 28 | 4 | - |
| R Ranch at the Lake | Napa, CA | 28 | 29 | - |
| Pestoni Family Estate Winery | St. Helena, CA | 28 | 7 | - |
| Evergreen Motel & MHP | Clayton, CA | 28 | 12 | - |
| Laguna Village RV Park | Elk Grove, CA | 28 | 18 | - |
| Bayer Research and Development LLC | Woodland, CA | 28 | 26 | - |
| Camp la Verne | La Verne, CA | 28 | 26 | - |
| Richardson Beardsley Park Inc. | Julian, CA | 28 | 26 | - |
| Haven of Peace | French Camp, CA | 28 | 20 | - |
| Idle Wild Market | Woodbridge, CA | 28 | 2 | - |
| Puente Housing Solutions | Pescadero, CA | 28 | 1 | - |
| Santa Cruz Mountain Pure WC | Los Gatos, CA | 28 | 35 | - |
| Csp-Nature Center | Felton, CA | 28 | 16 | - |
| Vca Forestville Animal Hospital | Sebastopol, CA | 28 | 0 | - |
| Padmasambhava Peace Institute | Cazadero, CA | 28 | 6 | - |
| Sonoma Pacific Pallet Company | Sonoma, CA | 28 | 0 | - |
| Wm. B. Ide Adobe | Oroville, CA | 28 | 10 | - |
| Monrovia Nursery - Office | Woodlake, CA | 28 | 25 | - |
| Kennedy Meadows General Store | Inyokern, CA | 28 | 10 | - |
| Monrovia Nursery - Venice Hills | Woodlake, CA | 28 | 11 | - |
| Chevron Lindsay | Lindsay, CA | 28 | 0 | - |
| Pinecrest Elementary School | Pinecrest, CA | 28 | 10 | - |
| Miner's Leap Winery | Sacramento, CA | 28 | 2 | - |
| Gibson's Roadhouse Cafe | Pioneer, CA | 27 | 11 | - |
| Slo 2 20 Winery | Plymouth, CA | 27 | 0 | - |
| Bella Grace Vineyards | Plymouth, CA | 27 | 4 | - |
| Dorabelle Mutual Water Company | Shaver Lake, CA | 27 | 22 | - |
| Driftwood Mobilehome Park | Ramona, CA | 27 | 28 | - |
| Belmont Temperance Property Water System | Fresno, CA | 27 | 65 | - |
| Blm San Joaquin River Gorge | Bakersfield, CA | 27 | 23 | - |
| Granville Farms, LLC | Fresno, CA | 27 | 0 | - |
| Segura's RV Park LLC | Newcastle, CA | 27 | 26 | - |
| Calenergy (Eng. & Tech.) | Calipatria, CA | 27 | 4 | - |
| Nps - Death Valley, Grapevine Rs | Death Valley, CA | 27 | 6 | - |
| Schweikart Water System | Bakersfield, CA | 27 | 17 | - |
| Jasmine Vineyards Cold Storage | Delano, CA | 27 | 1 | - |
| Days End RV Park | Susanville, CA | 27 | 3 | - |
| Mendocino Inn and Farm - A | Little River, CA | 27 | 8 | - |
| Mendocino Inn and Farm - B | Little River, CA | 27 | 4 | - |
| Mendocino Grove | Mendocino, CA | 27 | 2 | - |
| Kandola Farms Produce, Inc. | Livingston, CA | 27 | 12 | - |
| Hot Creek Ranch | Mammoth Lakes, CA | 27 | 25 | - |
| Latin Market 2 | Mammoth Lakes, CA | 27 | 33 | - |
| Oasis Cafe WS | Soledad, CA | 27 | 30 | - |