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 |
| Mount Madonna Center | Watsonville, CA | 170 | 18 | - |
| Hat Creek Resort & RV Park, LLC | Santa Monica, CA | 170 | 58 | - |
| Juniper Village Farm Labor Housing | Macdoel, CA | 170 | 2 | - |
| Neil's Service Center | Vacaville, CA | 170 | 3 | - |
| Sconza Candy Company | Oakdale, CA | 170 | 8 | - |
| Mountain View Elementary School | Denair, CA | 170 | 40 | - |
| Leoni Meadows Camp | Grizzly Flats, CA | 169 | 19 | - |
| Los Angeles World Airports | Los Angeles, CA | 169 | 5 | - |
| Moose Camp | Redding, CA | 169 | 33 | - |
| Plaza Mobile Home Park | Santa Cruz, CA | 169 | 10 | - |
| Colusa Landing | Colusa, CA | 168 | 4 | - |
| McGee Creek Campground | Bishop, CA | 168 | 14 | - |
| Hynes Estates Mutual Water Co. | Anaheim, CA | 168 | 21 | - |
| Melody Woods Water Company | Los Gatos, CA | 168 | 49 | - |
| Lake Shasta Pines RV Park & Campground | Dunsmuir, CA | 168 | 36 | - |
| Westminster Woods Camp | Occidental, CA | 168 | 21 | - |
| Knights Ferry Comm. Svc. Dist. | Knights Ferry, CA | 168 | 41 | - |
| Usfs Eureka Valley Campgd | Pinecrest, CA | 168 | 0 | - |
| Bishop Country Club | Bishop, CA | 167 | 18 | - |
| Cws - Fremont Valley | San Jose, CA | 167 | 17 | - |
| Crain Walnut Shelling, Inc. | Los Molinos, CA | 167 | 2 | - |
| Struve RD WS #02 | Elverta, CA | 166 | 55 | - |
| Lodi Usd-Turner Academy at Tokay Colony | Lodi, CA | 166 | 16 | - |
| Renaissance High School | Watsonville, CA | 166 | 21 | - |
| Koinonia Conference Grounds | Watsonville, CA | 166 | 47 | - |
| Okizu Foundation | Novato, CA | 165 | 0 | - |
| Cuddeback Grammar School | Carlotta, CA | 165 | 20 | - |
| San Joaquin Estates Mutual Water Company | Bakersfield, CA | 165 | 106 | - |
| Matsui Nursery WS | Salinas, CA | 165 | 33 | - |
| T & a Onions | Salinas, CA | 165 | 0 | - |
| Mt. Eden Mutual Water Company | Saratoga, CA | 165 | 25 | - |
| Anchorpoint Christian School | Gilroy, CA | 165 | 40 | - |
| Butteville Union School | Edgewood, CA | 165 | 4 | - |
| Williams Mutual Water Company | Porterville, CA | 165 | 45 | - |
| Saputo Dairy Food USA | Tulare, CA | 165 | 2 | - |
| YMCA Camp Sequoia Gaines | Visalia, CA | 164 | 21 | - |
| Carmel by the River RV Park WS | Carmel, CA | 164 | 38 | - |
| Psmcsd - Vierra Estates WS | Royal Oaks, CA | 164 | 27 | - |
| Superior Packing Co | Dixon, CA | 164 | 3 | - |
| Viejo Ltd | San Francisco, CA | 163 | 14 | - |
| Surrey Village Water Co. Inc. | Red Bluff, CA | 163 | 8 | - |
| Hartland Christian Camp | Badger, CA | 163 | 8 | - |
| Madera Co Md1-Hidden Lake Estates | Madera, CA | 162 | 111 | - |
| Laguna Seca WC | Salinas, CA | 162 | 148 | - |
| Whispering Winds Catholic Conference Cen | Julian, CA | 162 | 24 | - |
| Usfs - Camp 9 | Overland Park, CA | 161 | 20 | - |
| Merrill Gardens Iris Canyon WS | Monterey, CA | 161 | 2 | - |
| Schramsberg Winery | Calistoga, CA | 161 | 17 | - |
| Rollins Lake Resort, Long Ravine | Grass Valley, CA | 161 | 4 | - |
| Chuckwalla Valley Raceway Water System | Desert Center, CA | 161 | 35 | - |