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 |
|---|---|---|---|---|
| San Joaquin County - Lincoln Village | Stockton, CA | 5,990 | 5 | Clean |
| Malaga County Water District | Fresno, CA | 5,979 | 36 | Clean |
| Konocti County Water District | Clearlake, CA | 5,928 | 3 | Detected |
| Golden State Water Company - los Osos | Hawthorne, CA | 5,924 | 0 | Detected |
| Glen Helen Water System | San Bernardino, CA | 5,900 | 0 | Detected |
| Santa Ana River Water Company | Jurupa Valley, CA | 5,848 | 24 | Clean |
| Rancho Murieta Community Servi | Rancho Murieta, CA | 5,728 | 13 | Clean |
| Naval Base Ventura County, Point Mugu | Point Mugu, CA | 5,700 | 14 | - |
| Keyes Community Services Dist. | Keyes, CA | 5,672 | 122 | Clean |
| Tahoe City PUD - Main | Tahoe City, CA | 5,661 | 14 | Clean |
| Serrano Water District | Villa Park, CA | 5,659 | 8 | Detected |
| Golden State Water Co - Arden Water Serv | Rancho Cordova, CA | 5,658 | 6 | Clean |
| Cal Am - Meadowbrook | Sacramento, CA | 5,656 | 14 | Detected |
| Calistoga, City Of | Calistoga, CA | 5,610 | 32 | Detected |
| Camp Fresno Water System | Fresno, CA | 5,600 | 59 | - |
| Bear Valley Csd | Tehachapi, CA | 5,592 | 25 | Detected |
| Cdcr California Health Care Facility | Stockton, CA | 5,551 | 6 | - |
| City of Williams | Williams, CA | 5,538 | 6 | Clean |
| Cambria Comm Services Dist | Cambria, CA | 5,532 | 22 | Clean |
| Palm Ranch Irrigation Dist. | Quartz Hill, CA | 5,507 | 3 | Clean |
| Riverstone/Rootcreek Water District | Fresno, CA | 5,507 | 2 | - |
| Hilmar County Water District | Hilmar, CA | 5,504 | 16 | Clean |
| Maywood Mutual Water Co. #1 | Huntington Park, CA | 5,500 | 8 | Detected |
| Millview County Water District | Ukiah, CA | 5,500 | 6 | Clean |
| Tud - Columbia Water System | Sonora, CA | 5,463 | 2 | Clean |
| St. Helena, City Of | St. Helena, CA | 5,386 | 23 | Clean |
| La Habra Heights Cwd | La Habra Heights, CA | 5,325 | 0 | Detected |
| Yosemite Spring Park Util Co | Coarsegold, CA | 5,300 | 86 | Detected |
| Cwsc Salinas Hills | San Jose, CA | 5,293 | 6 | Clean |
| Running Springs Water District | Running Springs, CA | 5,268 | 12 | Detected |
| Suburban Water Systems-Glendora | Covina, CA | 5,249 | 2 | Clean |
| Valley Auto Water | Anza, CA | 5,215 | 3 | - |
| Redwood Valley County Water District | Ukiah, CA | 5,200 | 12 | Clean |
| Ccwd - Copper Cove | San Andreas, CA | 5,187 | 6 | Clean |
| City of Buellton Water Division | Buellton, CA | 5,161 | 13 | Clean |
| Wasco St. Prison Reception Ctr | Wasco, CA | 5,124 | 8 | Clean |
| California State Prison - Solano | Vacaville, CA | 5,100 | 10 | Clean |
| Denair Community Services District | Denair, CA | 5,090 | 25 | Clean |
| Sardine Lake Resort | Sierra City, CA | 5,040 | 14 | - |
| Joe's Travel Plaza (Eh) | Westley, CA | 5,026 | 18 | Clean |
| Willow Springs Raceway | Rosamond, CA | 5,022 | 19 | - |
| City of Jackson | Jackson, CA | 5,019 | 23 | Clean |
| Kern Valley State Prison | Delano, CA | 5,000 | 50 | Clean |
| Famoso Raceway, Smokers Inc. | Bakersfield, CA | 5,000 | 16 | - |
| Pleasant Valley Mutual Water Co | Camarillo, CA | 5,000 | 9 | Detected |
| City of Grass Valley | Grass Valley, CA | 4,947 | 4 | Clean |
| Awa, Tanner | Sutter Creek, CA | 4,940 | 16 | Clean |
| Stallion Springs Csd | Tehachapi, CA | 4,910 | 31 | Clean |
| La Cumbre Mutual Water Co | Santa Barbara, CA | 4,861 | 7 | Clean |
| Del Paso Manor County Water Di | Sacramento, CA | 4,854 | 5 | Clean |