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 |
| Gridley Farm Labor Housing | Chico, CA | 460 | 15 | - |
| Diamond Jim S Casino | Rosamond, CA | 460 | 14 | - |
| Pence Vineyards | Buellton, CA | 460 | 1 | - |
| Rincon Valley Mobile Estates | Novato, CA | 460 | 14 | - |
| Willowside School | Santa Rosa, CA | 460 | 6 | - |
| Clarksburg Middle School | Rio Vista, CA | 460 | 24 | - |
| Trailer Haven Mobile Home Park | Sacramento, CA | 459 | 4 | - |
| Point Arena Water Works | Point Arena, CA | 459 | 5 | - |
| Kennedy Grocery | La Quinta, CA | 458 | 77 | - |
| Centerville School | Sanger, CA | 456 | 24 | - |
| Buena Vista Migrant Center | Modesto, CA | 455 | 18 | - |
| Cloverdale Mutual Water Co. | Oxnard, CA | 455 | 8 | - |
| Primex Farms Water System | Wasco, CA | 454 | 9 | - |
| Wind Wolves Preserve | Bakersfield, CA | 452 | 26 | - |
| Delhi Kingdom Hall | Winton, CA | 452 | 11 | - |
| Buttonwillow Raceway Park Classic | Buttonwillow, CA | 451 | 9 | - |
| Usda-Forest Service Princess Campground | Overland Park, CA | 450 | 1 | - |
| Trinity Presbyterian Church | Clovis, CA | 450 | 16 | - |
| Lassen County Water District #1 | Bieber, CA | 450 | 2 | - |
| Shadow Acres Mutual Water Company | Palmdale, CA | 450 | 4 | - |
| Golden Sands Mobile Home Park | Rosemead, CA | 450 | 10 | - |
| Ilead Agua Dulce Charter School | Acton, CA | 450 | 14 | - |
| General Atomics Aeronautical - Gray Butt | Palmdale, CA | 450 | 3 | - |
| Madera Mh & RV Park | Madera, CA | 450 | 161 | - |
| Cbuso Mission Bell | Madera, CA | 450 | 74 | - |
| Skp Park of the Sierras Inc | Coarsegold, CA | 450 | 15 | - |
| Minarets High School | Oneals, CA | 450 | 7 | - |
| Yosemite Nps-Bridalveil Creek Cg | Yosemite Np, CA | 450 | 0 | - |
| Mother Truckers Water System | Grass Valley, CA | 450 | 0 | - |
| Nyack Water System | Emigrant Gap, CA | 450 | 15 | - |
| Lighthouse Marina Restaurant & Resort | Isleton, CA | 450 | 11 | - |
| Olympia Mobilodge | Fair Oaks, CA | 450 | 3 | Detected |
| Glen Martin MWC | Angelus Oaks, CA | 450 | 8 | - |
| County Service Area 11 | Redwood City, CA | 450 | 47 | - |
| Camp Saratoga | Saratoga, CA | 450 | 5 | - |
| Cinnabar Hills Golf Club | San Jose, CA | 450 | 10 | - |
| Pacheco Elementary School | Redding, CA | 450 | 6 | - |
| Ceres Unified/Westport School | Ceres, CA | 450 | 30 | - |
| Sierra Pacific Industries - Red Bluff MI | Red Bluff, CA | 450 | 1 | - |
| Clark System | Redding, CA | 450 | 6 | - |
| Clark Pacific - Cr 18C | Woodland, CA | 450 | 26 | - |
| Prather Water District | Clovis, CA | 449 | 48 | - |
| Lake County CSA 13 - Kono Tayee | Lakeport, CA | 449 | 4 | - |
| Weott C.s.d. | Phillipsville, CA | 448 | 70 | - |
| Warner Springs Estates | Temecula, CA | 448 | 162 | - |
| Willowside Mutual Water Company | Santa Rosa, CA | 448 | 16 | - |
| Antelope Park Mutual Water Company | Lancaster, CA | 445 | 6 | - |
| Laguna del Sol Inc | Wilton, CA | 445 | 1 | - |
| MI Wuk Heights MWC | MI Wuk Village, CA | 445 | 15 | - |
| Casini Ranch Campground | Duncan Mills, CA | 442 | 9 | - |