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 |
|---|---|---|---|---|
| City of Roseville | Roseville, CA | 155,612 | 7 | Clean |
| California Water Service Co. - Ela | San Jose, CA | 152,474 | 13 | Detected |
| Pomona - City, Water Dept. | Pomona, CA | 151,713 | 14 | Detected |
| Cws - Visalia | San Jose, CA | 148,496 | 4 | Detected |
| Rancho California Water District | Temecula, CA | 146,147 | 4 | Detected |
| California Water Service Co. - Dominguez | San Jose, CA | 143,996 | 19 | Detected |
| City of Fullerton | Fullerton, CA | 139,461 | 14 | Detected |
| Escondido, City Of | Escondido, CA | 137,044 | 2 | Clean |
| Victorville Water District | Victorville, CA | 135,983 | 13 | Clean |
| Jurupa Community SD | Jurupa Valley, CA | 135,093 | 16 | Clean |
| Vista Irrigation District | Vista, CA | 132,430 | 17 | Clean |
| El Dorado ID - Main | Placerville, CA | 132,171 | 26 | Detected |
| City of Santa Clara | Santa Clara, CA | 130,746 | 7 | Clean |
| City of Clovis | Clovis, CA | 130,130 | 14 | Detected |
| Palmdale Water Dist. | Palmdale, CA | 126,804 | 12 | Detected |
| Cwsc Salinas | San Jose, CA | 123,679 | 24 | Clean |
| City of Vallejo | Vallejo, CA | 121,420 | 12 | Clean |
| City of Orange | Orange, CA | 120,770 | 6 | Detected |
| City of Fairfield | Fairfield, CA | 120,377 | 8 | Clean |
| City of Antioch | Antioch, CA | 115,074 | 6 | Clean |
| Cal-Water Service Co.-Chico | San Jose, CA | 114,925 | 17 | Detected |
| Golden State WC - West Orange County | Anaheim, CA | 114,379 | 0 | Detected |
| Vallecitos WD | San Marcos, CA | 113,500 | 2 | Clean |
| Ventura Water Department | Ventura, CA | 113,500 | 12 | Detected |
| Great Oaks WC Inc | San Jose, CA | 110,088 | 11 | Detected |
| Azusa Light and Water | Azusa, CA | 110,044 | 2 | Detected |
| Mesa Water District | Costa Mesa, CA | 110,000 | 4 | Clean |
| San Bernardino Valley WD | San Bernardino, CA | 109,608 | 2 | - |
| City of Santa Maria Utilities Department | Santa Maria, CA | 109,477 | 13 | Clean |
| Downey - City, Water Dept. | Downey, CA | 108,816 | 16 | Detected |
| East Valley Water District | Highland, CA | 108,629 | 13 | Detected |
| Torrance-City, Water Dept. | Torrance, CA | 106,183 | 57 | Clean |
| Cal-Am Water Coronado | Imperial Beach, CA | 106,000 | 2 | Clean |
| Burbank-City, Water Dept. | Burbank, CA | 105,603 | 16 | Detected |
| City of Daly City | Daly City, CA | 104,901 | 12 | Clean |
| West Valley Water District | Rialto, CA | 104,498 | 19 | Clean |
| California Water Service - San Mateo | San Jose, CA | 102,348 | 7 | Clean |
| City of San Jose - Evg/Edv/Coy | San Jose, CA | 101,265 | 6 | Clean |
| Walnut Valley Water District | Walnut, CA | 100,941 | 5 | Clean |
| Hesperia WD | Hesperia, CA | 100,744 | 7 | Detected |
| South Tahoe PUD - Main | South Lake Tahoe, CA | 100,000 | 13 | Detected |
| City of Santa Barbara Water Department | Santa Barbara, CA | 98,872 | 9 | Clean |
| Dublin San Ramon Services District | Pleasanton, CA | 98,776 | 4 | Clean |
| City of Vacaville | Elmira, CA | 97,000 | 7 | Detected |
| California Water Service Co. - Herm/Redo | San Jose, CA | 96,853 | 10 | Clean |
| Tracy, City Of | Tracy, CA | 96,609 | 10 | Clean |
| Carlsbad MWD | Carlsbad, CA | 95,158 | 0 | Clean |
| Ventura Wwd No. 8 - Simi Valley | Simi Valley, CA | 94,738 | 12 | Clean |
| Santa Cruz Water Department | Santa Cruz, CA | 94,626 | 15 | Clean |
| Padre Dam MWD | Santee, CA | 93,859 | 4 | Detected |