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 |
| Yongs Bar & Grill Water System | Holt, CA | 30 | 8 | - |
| Gaf Materials Co | Parsippany, CA | 30 | 45 | - |
| S M S Briners Inc | Sunol, CA | 30 | 13 | - |
| Zuckerman, Roscoe 39-316 | Stockton, CA | 30 | 11 | - |
| Larsen Ranch 39-40/Water System | Manteca, CA | 30 | 65 | - |
| P G & E-Turner Cut Water System | Oakland, CA | 30 | 18 | - |
| River Road Produce Water System | Escalon, CA | 30 | 0 | - |
| Higuera Apartments | San Luis Obispo, CA | 30 | 35 | - |
| Mutual Water Association | Arroyo Grande, CA | 30 | 7 | - |
| Longbranch Saloon, The | Creston, CA | 30 | 50 | - |
| Holdgrafer & Associates | San Luis Obispo, CA | 30 | 21 | - |
| Cerro Alto Campground | Santa Maria, CA | 30 | 12 | - |
| Mustang Springs Mutual Water | Paso Robles, CA | 30 | 15 | - |
| Caelesta Winery | Thousand Oaks, CA | 30 | 0 | - |
| Jonata Homeowners Association | Buellton, CA | 30 | 4 | - |
| Live Oak Creek Mutual Water Company | CA | 30 | 0 | - |
| San Martin Lions Club | San Martin, CA | 30 | 6 | - |
| Rockwood Estates Mutual Water Company | Morgan Hill, CA | 30 | 2 | - |
| Cassin Ranch (Driscoll's) | Watsonville, CA | 30 | 0 | - |
| Basshole Brews | Lakehead, CA | 30 | 3 | - |
| The Summit | Santa Fe, CA | 30 | 11 | - |
| Rainbow's End Mobile Home Park | Burney, CA | 30 | 3 | - |
| Camp Leonard, Sierra NV F.c. | San Francisco, CA | 30 | 1 | - |
| Dillon Creek Campground-Srnf | Orleans, CA | 30 | 0 | - |
| Juanita Lake Campground | Yreka, CA | 30 | 1 | - |
| Mt. Hebron Work Center | Yreka, CA | 30 | 3 | - |
| Sawyer S Bar Work Center | Yreka, CA | 30 | 1 | - |
| Klamath Basin National Wildlife Refuge | Tulelake, CA | 30 | 4 | - |
| Redwood Heights Mutual Water Company | Cazadero, CA | 30 | 66 | - |
| Seneca Family of Agencies | Oakland, CA | 30 | 14 | - |
| Schug Cellars | Sonoma, CA | 30 | 8 | - |
| Lieto Water System (Reach Chartr School) | Sebastopol, CA | 30 | 12 | - |
| Plumfield Academy School (Occidental RD) | Sebastopol, CA | 30 | 0 | - |
| The Rental Place | Sonoma, CA | 30 | 86 | - |
| Matrix Winery | Healdsburg, CA | 30 | 4 | - |
| Bucher Water Company | Healdsburg, CA | 30 | 5 | - |
| Wine Country Ind Park-Bldgs A&b | Sonoma, CA | 30 | 9 | - |
| Moshin Vineyards | Healdsburg, CA | 30 | 2 | - |
| Hawkes Winery | Healdsburg, CA | 30 | 0 | - |
| Wilson Winery | Healdsburg, CA | 30 | 2 | - |
| Buckley Family Partnership | Sonoma, CA | 30 | 1 | - |
| Azure Acres Cd Recovery Center | Sebastopol, CA | 30 | 4 | - |
| Fat Pilgrim General Store | Sonoma, CA | 30 | 0 | - |
| Zialena Winery | Healdsburg, CA | 30 | 2 | - |
| Macdonald Bunkhouse | Healdsburg, CA | 30 | 1 | - |
| Rainbow Farms | Turlock, CA | 30 | 17 | - |
| Tds California | Turlock, CA | 30 | 10 | - |
| California Nut Company | Denair, CA | 30 | 4 | - |
| Jennings WWTP | Modesto, CA | 30 | 4 | - |
| Rancho Tehama Association | Corning, CA | 30 | 3 | - |