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 |
|---|---|---|---|---|
| Cal/Am Water Company - San Marino | Rosemead, CA | 47,995 | 2 | Detected |
| San Luis Obispo Water Department | San Luis Obispo, CA | 47,788 | 2 | Clean |
| Cerritos - City, Water Dept. | Cerritos, CA | 47,475 | 0 | Detected |
| City of los Banos | Los Banos, CA | 47,419 | 10 | Clean |
| City of Morgan Hill | Morgann Hill, CA | 47,374 | 256 | Detected |
| Golden State Water Co. - Cordova | Rancho Cordova, CA | 47,161 | 12 | Clean |
| Camarillo Water Dept | Camarillo, CA | 46,824 | 0 | Clean |
| Colton, City Of | Colton, CA | 46,525 | 3 | Detected |
| Bellflower - Somerset MWC | Bellflower, CA | 46,300 | 2 | Detected |
| City of San Jose - Nsj/Alviso | San Jose, CA | 45,559 | 10 | Clean |
| Golden State Water Company - Simi Valley | Rancho Cordova, CA | 45,128 | 0 | Clean |
| Oildale MWC | Bakersfield, CA | 44,899 | 24 | Clean |
| Hawthorne-City Water Dept. | San Jose, CA | 44,718 | 8 | Clean |
| Rohnert Park, City Of | Rohnert Park, CA | 43,821 | 561 | Detected |
| Elk Grove Water District | Elk Grove, CA | 43,813 | 6 | Detected |
| El Centro, City Of | El Centro, CA | 43,772 | 12 | Clean |
| Coachella Water Authority | Coachella, CA | 43,590 | 24 | Clean |
| Mission Springs WD | Desert Hot Springs, CA | 43,484 | 21 | Clean |
| Diablo Water District | Oakley, CA | 43,357 | 0 | Clean |
| Gswc - Norwalk | Anaheim, CA | 43,176 | 3 | Detected |
| Camp Pendleton (South) | Camp Pendleton, CA | 42,219 | 40 | Detected |
| Sacramento International Airport [Sws] | Sacramento, CA | 41,717 | 2 | Clean |
| Indian Wells Valley W.D. | Ridgecrest, CA | 41,580 | 44 | Clean |
| City of San Bruno | San Bruno, CA | 41,327 | 2 | Clean |
| Carmichael Water District | Carmichael, CA | 41,193 | 4 | Detected |
| South Coast Water District | Laguna Beach, CA | 41,118 | 4 | Detected |
| California State University Fresno | Fresno, CA | 41,000 | 4 | Detected |
| Soquel Creek Water District | Soquel, CA | 40,809 | 4 | Clean |
| Pico Rivera - City, Water Dept. | Pico Rivera, CA | 40,600 | 17 | Detected |
| Lompoc-City Water Utility Div | Lompoc, CA | 40,473 | 8 | Clean |
| San Dieguito WD | Encinitas, CA | 40,405 | 3 | Detected |
| Calexico, City Of | Calexico, CA | 40,357 | 17 | Clean |
| Beverly Hills-City, Water Dept. | Beverly Hills, CA | 40,121 | 91 | Clean |
| Adelanto, City Of | Adelanto, CA | 39,930 | 40 | Detected |
| Gswc - Claremont | San Dimas, CA | 39,730 | 6 | Detected |
| Santa Margarita Water District-Id9 | Rancho Santa Margarita, CA | 39,684 | 22 | Clean |
| San Gabriel County WD | Rosemead, CA | 39,345 | 0 | Clean |
| City of Livermore | Livermore, CA | 38,892 | 2 | Clean |
| North Coast County Water Dist | Pacifica, CA | 38,546 | 5 | Clean |
| Marina Coast Water District | Marina, CA | 38,377 | 8 | Clean |
| Gswc - Culver City | Anaheim, CA | 38,213 | 7 | Clean |
| Tejon Castac WD - I5 & Laval RD | Lebec, CA | 38,125 | 26 | Clean |
| Monrovia-City, Water Dept. | Monrovia, CA | 37,931 | 3 | Detected |
| Vaughn WC Inc | Bakersfield, CA | 37,189 | 14 | Detected |
| Ramona Municipal WD | Ramona, CA | 37,047 | 2 | Clean |
| Nas North Island & Nab Coronado | San Diego, CA | 36,990 | 9 | Clean |
| Rubidoux Community SD | Jurupa Valley, CA | 36,827 | 103 | Detected |
| Truckee-Donner PUD, Main | Truckee, CA | 36,730 | 6 | Detected |
| Pine Valley Border Patrol Station | San Diego, CA | 36,604 | 3 | - |
| Estero Municipal Improvement District | Foster City, CA | 36,556 | 7 | Clean |