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 |
| South Kern Mutual Water Company | Clovis, CA | 32 | 37 | - |
| Tut Brothers Farm #96 | Watsonville, CA | 32 | 85 | - |
| Meadows of the Kern Mutual Water Company | Bakersfield, CA | 32 | 17 | - |
| Prince Truck Stop Water System | Bakersfield, CA | 32 | 0 | - |
| Blue Lakes Mobile Home Park | San Mateo, CA | 32 | 49 | - |
| Lassen Co. Off. of Education | Susanville, CA | 32 | 8 | - |
| Quady Residence and Wnery | Madera, CA | 32 | 10 | - |
| Whispering Pines Apartments | Midpines, CA | 32 | 47 | - |
| Orchard Ln WS #02 | Salinas, CA | 32 | 19 | - |
| Joseph Cellars Winery | Calistoga, CA | 32 | 20 | - |
| Stags Leap Winery | Napa, CA | 32 | 19 | - |
| Frccsd Old Mill Ranch | Twain, CA | 32 | 30 | - |
| Stafford Meat Company | Rio Linda, CA | 32 | 8 | - |
| Prairie City Svra | Folsom, CA | 32 | 1 | - |
| Horizon Lane Water Supply | San Luis Obispo, CA | 32 | 3 | - |
| San Gregorio Company | San Gregorio, CA | 32 | 27 | - |
| Aptos Hills Mutual Water Co | Watsonville, CA | 32 | 29 | - |
| Burney Mountain Guest Ranch | Cassel, CA | 32 | 0 | - |
| Oak Bottom Cg & WC | Orleans, CA | 32 | 0 | - |
| Shastina Mobile Estates | Roseville, CA | 32 | 7 | - |
| East Austin Creek Mutual Water Company | Cazadero, CA | 32 | 18 | - |
| Turlock Sportsman's Club | Turlock, CA | 32 | 2 | - |
| Flournoy School | Flournoy, CA | 32 | 12 | - |
| Usfs Beardsley Campground | Sonora, CA | 32 | 0 | - |
| Elkhorn Regional Park | Woodland, CA | 32 | 11 | - |
| Amador Flower Farm | Plymouth, CA | 31 | 0 | - |
| Willow Creek M.W.C.-Lambertville | Willows, CA | 31 | 2 | - |
| Wilcox Station Ranch | Canyon, CA | 31 | 15 | - |
| Christian Service Center of Senator Wash | Winterhaven, CA | 31 | 4 | - |
| Paradise Water System | Bakersfield, CA | 31 | 53 | - |
| Madera Co Bass Lake Govt Center | Madera, CA | 31 | 0 | - |
| Buck Meadows Lodge-Yosemite Westgate | San Francisco, CA | 31 | 6 | - |
| I & E Lath Mill | Philo, CA | 31 | 2 | - |
| Stevinson Bar and Grill | Stevinson, CA | 31 | 2 | - |
| Spreckels Ln WS #02 | Salinas, CA | 31 | 4 | - |
| Rosecrest Mutual | Roseville, CA | 31 | 18 | - |
| Anza Borrego Sp - Vallecito | Borrego Springs, CA | 31 | 0 | - |
| Durham Ferry Community School | Stockton, CA | 31 | 21 | - |
| Burlington Northern Santa Fe | San Bernardino, CA | 31 | 12 | - |
| Camp Shasta Coffee Company | Lakehead, CA | 31 | 6 | - |
| Quivira Vineyards | Healdsburg, CA | 31 | 35 | - |
| Michael Ellis School for Dog Trainers | Sebastopol, CA | 31 | 12 | - |
| Gleanings for the Hungry | Sultana, CA | 31 | 223 | - |
| Soults Pump & Equipment Company | Tulare, CA | 31 | 8 | - |
| Sorenson S HOA | Mapleton, CA | 30 | 24 | - |
| Alpine Co Community Development | Markleeville, CA | 30 | 2 | - |
| Calvary Concow Church | Yankee Hill, CA | 30 | 0 | - |
| Butte Meadows Camp | Susanville, CA | 30 | 4 | - |
| Cohasset Industrial Park | Chico, CA | 30 | 22 | - |
| Tamarack Springs Mutual Water | Lodi, CA | 30 | 50 | - |