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 |
| Keefer Creek Estates | Chico, CA | 160 | 10 | - |
| Lakeview Improvement Association 1 | Coalinga, CA | 160 | 77 | - |
| Comunidad Nuevo Lago, Inc | Turlock, CA | 160 | 24 | - |
| Kings Park Apartments | Sanger, CA | 160 | 59 | - |
| Jitter Bean Coffee | Lakeport, CA | 160 | 4 | - |
| Mettler Valley Mutual | Lancaster, CA | 160 | 73 | - |
| Sleepy Valley Water Company | Santa Clarita, CA | 160 | 13 | - |
| Dragonfly Golf Course/Water | Madera, CA | 160 | 12 | - |
| Surfwood Mutual Water Corporation | Mendocino, CA | 160 | 128 | - |
| Pattersons Pub | Mendocino, CA | 160 | 0 | - |
| Esperanza RD WS | Soledad, CA | 160 | 5 | - |
| Clear Creek School | Grass Valley, CA | 160 | 16 | - |
| San Justo Mutual Water Company | Hollister, CA | 160 | 74 | - |
| Mitsubishi Cement Plant Cushenbury | Lucerne Valley, CA | 160 | 2 | - |
| San Antonio Winery | Ontario, CA | 160 | 14 | - |
| Clover Flat Elementary School | Pine Valley, CA | 160 | 26 | - |
| Dhs Border Patrol I-8 Checkpoint | San Diego, CA | 160 | 10 | - |
| Usn Camp Michael Monsoor | San Diego, CA | 160 | 0 | - |
| IL Vineto | Hillsborough, CA | 160 | 24 | - |
| Painted Cave | Santa Barbara, CA | 160 | 30 | - |
| Brick Barn Estate Winery | Buellton, CA | 160 | 0 | - |
| Bonny Doon School | Santa Cruz, CA | 160 | 12 | - |
| Auction Mart Snack Bar | Anderson, CA | 160 | 10 | - |
| Rodney Strong Vineyards | Healdsburg, CA | 160 | 73 | Clean |
| Saint Francis Winery-Wild Oak Vineyards | Santa Rosa, CA | 160 | 10 | - |
| Grace Community Christian Church | Ceres, CA | 160 | 2 | - |
| Browns Elementary School | Rio Oso, CA | 160 | 14 | - |
| California Dairies Inc Tipton | Tipton, CA | 160 | 2 | - |
| Siesta Mobile Home Park | Oxnard, CA | 160 | 71 | - |
| Navalair Mobile Home Park | Oxnard, CA | 160 | 22 | - |
| Clarksburg Comm Church | Clarksburg, CA | 160 | 9 | - |
| Fellowship of Friends | Oregon House, CA | 160 | 5 | - |
| Golden State Water Co - San Juan Oaks | Rancho Cordova, CA | 159 | 0 | - |
| Moose Lodge 1967 | Vacaville, CA | 159 | 10 | - |
| Musick Creek Tract Association | Clovis, CA | 158 | 20 | - |
| Wilson Circle Mutual Water Company | Bishop, CA | 158 | 6 | - |
| Aqua J. Mutual Water Company | Lancaster, CA | 158 | 14 | - |
| Woodson Bridge MHP | Silverdale, CA | 158 | 17 | - |
| Zamora Shell & Mini Mart | Zamora, CA | 158 | 59 | - |
| Musd - Sierra Foothill Charter School | Mariposa, CA | 157 | 10 | - |
| Woods, the (Mendocino) | Santa Cruz, CA | 157 | 2 | - |
| Thomas Mountain Water Company | Mountain Center, CA | 157 | 48 | - |
| Cedar Lake Camp Inc | Redlands, CA | 157 | 2 | - |
| Gas Point Market | Cottonwood, CA | 157 | 2 | - |
| Russian River Vineyards & Restaurant | Forestville, CA | 157 | 13 | - |
| Andy's Produce Market, Inc. | Sebastopol, CA | 157 | 26 | - |
| Del Loma RV Park & Cg | Big Bar, CA | 157 | 11 | - |
| Sequoia Crest Mutual Water Company | Springville, CA | 157 | 11 | - |
| Big Oak Mobile Home Park Water | Oakley, CA | 156 | 13 | - |
| Lower Line Creek Imprvmnt Assn | Kerman, CA | 156 | 47 | - |