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 |
|---|---|---|---|---|
| Riverside Highland Water Company | Grand Terrace, CA | 20,188 | 6 | Detected |
| Humboldt C.s.d. | Cutten, CA | 19,807 | 7 | Clean |
| Arvin Community Services Dist | Arvin, CA | 19,669 | 331 | Clean |
| California Water Service Co - Westlake | San Jose, CA | 19,533 | 0 | Clean |
| Soledad, City Of | Soledad, CA | 19,455 | 22 | Clean |
| Phelps Vineyards | St. Helena, CA | 19,412 | 14 | - |
| Santa Fe Springs - City, Water Dept. | Santa Fe Springs, CA | 19,219 | 11 | Detected |
| Quartz Hill Water Dist. | Quartz Hill, CA | 19,100 | 4 | Clean |
| Lamont Public Utility Dist | Lamont, CA | 19,057 | 128 | Clean |
| Greenfield, City Of | Greenfield, CA | 18,967 | 13 | Clean |
| San Jacinto, City Of | San Jacinto, CA | 18,950 | 11 | Clean |
| Coastside County Water District | Half Moon Bay, CA | 18,940 | 33 | Clean |
| South Bay Rod & Gun Club Inc. | San Diego, CA | 18,900 | 55 | - |
| Twentynine Palms Water District | Twentynine Palms, CA | 18,795 | 254 | Clean |
| Bella Vista Water District | Redding, CA | 18,612 | 9 | Clean |
| Nps Ggnra | Sausalito, CA | 18,447 | 22 | Clean |
| Laguna Beach County WD | Laguna Beach, CA | 18,404 | 2 | Clean |
| California Water Service Co.-Travis Afb | San Jose, CA | 18,111 | 20 | Clean |
| Butte-Glenn Community College Dist | Oroville, CA | 18,000 | 4 | Clean |
| Yuba County Motorplex | Yuba City, CA | 18,000 | 0 | - |
| City of Arroyo Grande Utilities Division | Arroyo Grande, CA | 17,963 | 7 | Detected |
| Rosamond Csd | Rosamond, CA | 17,711 | 23 | Clean |
| Western MWD - Murrieta Division | Riverside, CA | 17,453 | 14 | Detected |
| Bakman Water Company | Fresno, CA | 17,393 | 14 | Clean |
| Coalinga-City | Coalinga, CA | 17,277 | 77 | Clean |
| City of Crescent City | Crescent City, CA | 17,262 | 3 | Clean |
| Kerman, City Of | Kerman, CA | 17,256 | 26 | Clean |
| Nevada ID - E. George, Banner Mountain | Grass Valley, CA | 17,154 | 0 | Clean |
| McKinleyville C.s.d. | McKinleyville, CA | 16,900 | 8 | Clean |
| Orange Vale Water Company | Orangevale, CA | 16,861 | 6 | Clean |
| Bishop Creek Chevron | Bishop, CA | 16,793 | 0 | - |
| Town of Discovery Bay | Discovery Bay, CA | 16,790 | 6 | Clean |
| Pinedale County Water District | Pinedale, CA | 16,736 | 33 | Detected |
| Ukiah, City Of | Ukiah, CA | 16,607 | 4 | Detected |
| Olivehurst Public U.d. | Olivehurst, CA | 16,595 | 28 | Clean |
| El Segundo-City, Water Dept. | El Segundo, CA | 16,445 | 4 | Clean |
| Fillmore Water Dept | Fillmore, CA | 16,419 | 13 | Clean |
| City of Cupertino | San Jose, CA | 16,336 | 15 | Clean |
| Cwsc King City | San Jose, CA | 16,334 | 4 | Clean |
| Nasa Ames Research Center | Moffett Field, CA | 16,273 | 4 | Clean |
| Walnut Park Mutual Water Co. | Huntington Park, CA | 16,180 | 12 | Clean |
| Lincoln Avenue Water Co. | Altadena, CA | 16,088 | 3 | - |
| Carpinteria Valley Water District | Carpinteria, CA | 15,996 | 10 | Clean |
| City of la Palma | La Palma, CA | 15,948 | 8 | Clean |
| Ripon, City Of | Ripon, CA | 15,741 | 30 | Detected |
| US Army Fort Irwin | Fort Irwin, CA | 15,701 | 146 | Clean |
| Cal Am - Fruitridge Vista | Sacramento, CA | 15,652 | 8 | Clean |
| Rio Linda/Elverta Community Water Dist | Rio Linda, CA | 15,460 | 19 | Detected |
| Northstar C.s.d. | Truckee, CA | 15,452 | 6 | Clean |
| Huntington Park-City, Water Dept. | Huntington Park, CA | 15,437 | 3 | Detected |