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 |
| Oak Knoll Village | Pala, CA | 66 | 24 | - |
| Rolling Hills Mutual Water Company | Orcutt, CA | 66 | 28 | - |
| Spring Valley Heights Association Inc | Milpitas, CA | 66 | 7 | - |
| Golden Heights Mutual Water Company | Gilroy, CA | 66 | 4 | - |
| Naples | Carpinteria, CA | 66 | 4 | - |
| Foxen Vineyard Inc. | Santa Maria, CA | 66 | 2 | - |
| Six Acres Water Company | San Francisco, CA | 66 | 103 | - |
| Robin Way Water System | Fairfield, CA | 66 | 37 | - |
| King Fresh Packing & Cooling | Dinuba, CA | 66 | 10 | - |
| Kirkwood Campground | Hollister, CA | 65 | 10 | - |
| Wahl Family Water System | Brentwood, CA | 65 | 18 | - |
| Butte Court Mobile Home Park | Mather, CA | 65 | 25 | - |
| Latrobe Elementary School | Shingle Springs, CA | 65 | 28 | - |
| Docmanov Vineyards | Placerville, CA | 65 | 0 | - |
| Lotus Pub | Lotus, CA | 65 | 31 | - |
| American Legion Tract Resort Assoc | Folsom, CA | 65 | 3 | - |
| Azalea Glen | Trinidad, CA | 65 | 25 | - |
| Ranch Road Estates Mutual Water Company | Bishop, CA | 65 | 5 | - |
| Inyo County Pwd - Laws Town | Independence, CA | 65 | 9 | - |
| Rose Villa Apartments | Rancho Palos Verdes, CA | 65 | 56 | - |
| Delta Trading Water System | Bakersfield, CA | 65 | 12 | - |
| Delano Growers Grape Products | Delano, CA | 65 | 4 | - |
| Blue Lakes Village | Santa Rosa, CA | 65 | 36 | - |
| Narrows Family Resort | Upper Lake, CA | 65 | 0 | - |
| Los Angeles, City of - Castaic Pwr Plant | Los Angeles, CA | 65 | 0 | - |
| Fenner Canyon Youth Conservation Camp | Valyermo, CA | 65 | 7 | - |
| Lds Church Mariposa | Tulare, CA | 65 | 6 | - |
| Yosemite's Scenic Wonders | Santa Monica, CA | 65 | 0 | - |
| Harris Woolf Almonds-Ballico | Ballico, CA | 65 | 3 | - |
| Tioga Lake Campground | Bishop, CA | 65 | 22 | - |
| Cold Water Canyon MWC | Bishop, CA | 65 | 0 | - |
| Hidden Views MHP WS | King City, CA | 65 | 79 | - |
| Murphy Hill WS #01 | Watsonville, CA | 65 | 94 | - |
| Garlen Court WS | Salinas, CA | 65 | 39 | - |
| River RD WS #25 | Gonzales, CA | 65 | 216 | - |
| Vierra Meadows MWC | Salinas, CA | 65 | 42 | - |
| Capurro & Son WS | Moss Landing, CA | 65 | 7 | - |
| Calistoga Farm Worker Center | Napa, CA | 65 | 2 | - |
| Cosentino Winery | Napa, CA | 65 | 6 | - |
| Cal Fire Sonoma-Lake-Napa Unit Hq | St. Helena, CA | 65 | 2 | - |
| Dripping Springs Cg- Usfs | San Diego, CA | 65 | 21 | - |
| Westerner Mobile Home Park | Elk Grove, CA | 65 | 46 | - |
| Trap the (Sws) | Sacramento, CA | 65 | 4 | - |
| Enza Zaden Research | San Juan Bautista, CA | 65 | 10 | - |
| Brookside MHP | Mentone, CA | 65 | 63 | - |
| Cdf - Pilot Rock Conservation Camp | Crestline, CA | 65 | 10 | - |
| Usn Sere Camp Warner Springs | San Diego, CA | 65 | 7 | - |
| Bethany Temple Water System | Stockton, CA | 65 | 20 | - |
| Monte Sereno Mutual Benefit Water | San Luis Obispo, CA | 65 | 0 | - |
| Loma Mar Mutual | Loma Mar, CA | 65 | 67 | - |