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 |
|---|---|---|---|---|
| Julian Community Services District | Julian, CA | 1,517 | 175 | - |
| Pearsonville Water System | Bishop, CA | 1,515 | 13 | - |
| Little Potato Slough Mutual | Lodi, CA | 1,510 | 29 | - |
| Richardson Grove Sp-State Parks | Eureka, CA | 1,509 | 5 | - |
| Buttonwillow Cwd | Buttonwillow, CA | 1,508 | 19 | - |
| Mariana Ranchos Cwd | Apple Valley, CA | 1,502 | 20 | - |
| Nojoqui Falls County Park | Santa Maria, CA | 1,502 | 10 | - |
| Aera Energy-LLC | McKittrick, CA | 1,500 | 16 | - |
| Cal Trans Buttonwillow Sfty Rsra | Fresno, CA | 1,500 | 26 | - |
| Camp Verdugo Oaks Boyscouts | Arcadia, CA | 1,500 | 13 | - |
| Lynwood Park Mutual Water Co. | Compton, CA | 1,500 | 25 | - |
| U.S. Army Corps-Lake Mendo (Kyen Cmpgrd) | Ukiah, CA | 1,500 | 6 | - |
| Dole Atwater Plant | Atwater, CA | 1,500 | 18 | - |
| Palisades Tahoe 8200 Water System | Olympic Valley, CA | 1,500 | 54 | Clean |
| Antlers Shell / Subway | Lakehead, CA | 1,500 | 17 | - |
| Springville PUD | Springville, CA | 1,500 | 25 | - |
| Golden State Water Company - Edna | Hawthorne, CA | 1,493 | 2 | - |
| Del Rey Community Serv Dist | Del Rey, CA | 1,491 | 20 | - |
| Midway Heights C. W. D. | Meadow Vista, CA | 1,491 | 82 | - |
| Oakwood Lake Water District-Subdivision | Stockton, CA | 1,479 | 12 | - |
| Guadalupe Valley Mid | Brisbane, CA | 1,472 | 8 | Detected |
| Los Molinos Comm. Services Dist. | Los Molinos, CA | 1,450 | 121 | - |
| Inverness Public Utility Dist | Inverness, CA | 1,445 | 99 | - |
| Suburban Water Systems-Covina Knolls | Covina, CA | 1,437 | 4 | - |
| Ventura Cwwd No. 19 - Somis | Moorpark, CA | 1,429 | 2 | - |
| Tahoe Keys Water Company | South Lake Tahoe, CA | 1,420 | 17 | - |
| Csp-Mackerricher State Park | Duncans Mills, CA | 1,416 | 10 | - |
| Leavitt Campground | Sparks, CA | 1,405 | 28 | - |
| Alameda Point | Oakland, CA | 1,400 | 0 | - |
| Usfs/Dinkey Creek Campground | Clovis, CA | 1,400 | 27 | - |
| Highland Mobile Home Park | Bishop, CA | 1,400 | 5 | - |
| Caltrans-Collier Rest Stop | Redding, CA | 1,400 | 2 | - |
| West Almanor M.W.C. | Chester, CA | 1,394 | 6 | - |
| California Water Service Co.-Lancaster | San Jose, CA | 1,387 | 6 | Clean |
| Lassen Community College Dist. | Susanville, CA | 1,380 | 7 | - |
| Lebec County Water District | Lebec, CA | 1,379 | 125 | - |
| Grizzly Flats Community Servic | Grizzly Flats, CA | 1,374 | 9 | - |
| Hydesville Co. W.D. | Hydesville, CA | 1,366 | 20 | - |
| Aptos High School | Watsonville, CA | 1,348 | 14 | - |
| Garden Acres Mutual Water Co | Oxnard, CA | 1,335 | 16 | - |
| City of Modesto - del Rio | Modesto, CA | 1,327 | 7 | - |
| Lower Lake County Water District | Lower Lake, CA | 1,326 | 12 | - |
| Usfs - Old Isabella Auxiliary Dam WS | Overland Park, CA | 1,320 | 0 | - |
| McCloud C.s.d. | McCloud, CA | 1,317 | 35 | - |
| Grizzly Lake Csd-Delleker | Portola, CA | 1,314 | 103 | - |
| Rural North Vacaville Water District | Vacaville, CA | 1,313 | 0 | - |
| Mission Springs Conference Center | Scotts Valley, CA | 1,310 | 35 | - |
| Midway City Mutual WC | Westminster, CA | 1,305 | 32 | - |
| Caltrans - Shandon Rest Stop | San Luis Obispo, CA | 1,300 | 10 | - |
| Willow Creek C.s.d. | Willow Creek, CA | 1,298 | 7 | - |