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 |
| Agua Caliente County Park | San Diego, CA | 400 | 23 | - |
| Kq Ranch Resort | Parker, CA | 400 | 9 | - |
| Pinezanita Inc. | Julian, CA | 400 | 6 | - |
| Twin Lakes Resort | Potrero, CA | 400 | 69 | - |
| Gsa Tecate Port of Entry | San Diego, CA | 400 | 10 | - |
| Wienerschnitzel | Stockton, CA | 400 | 0 | - |
| Vines R.V. Resort | Paso Robles, CA | 400 | 0 | - |
| Monterey Bay Academy | La Selva Beach, CA | 400 | 22 | - |
| Neighborhood Church Anderson Cottonwood | Anderson, CA | 400 | 2 | - |
| Olivet Elementary School | Santa Rosa, CA | 400 | 7 | - |
| Twin Hills School Dist-Twin Hills School | Sebastopol, CA | 400 | 8 | - |
| Twin Hills School Dist-Apple Blossom Sch | Sebastopol, CA | 400 | 5 | - |
| Csp-Goat Rock State Beach | Mendocino, CA | 400 | 6 | - |
| Bronco Winery | Ceres, CA | 400 | 19 | - |
| Caltrans-Salyer Safety Rest Stop | Eureka, CA | 400 | 2 | - |
| Grand View School | Dinuba, CA | 400 | 20 | - |
| Sequoia Union Elementary School | Lemon Cove, CA | 400 | 132 | - |
| Riverland Resort | Reedley, CA | 400 | 22 | - |
| Monarch Nut Company | Delano, CA | 400 | 68 | - |
| Sierra Park Water Company Inc. | MI-Wuk Village, CA | 400 | 16 | - |
| Plainfield Elem School - Water | Woodland, CA | 400 | 8 | - |
| Butte Creek Estates Mutual Water Co | Chico, CA | 399 | 26 | - |
| Palm Springs Crest | Desert Hot Springs, CA | 399 | 2 | - |
| Gravenstein School District-Gravenstein | Sebastopol, CA | 398 | 9 | - |
| Orick C.s.d. | Orick, CA | 396 | 15 | - |
| Chamisal WA | Salinas, CA | 396 | 19 | - |
| Fcsa 39 - a and B | Fresno, CA | 395 | 13 | - |
| Winterhaven County Water District | Winterhaven, CA | 394 | 32 | - |
| Stockdale Ranchos Mutual Water Co | Bakersfield, CA | 393 | 9 | - |
| Blythe - Hidden Beaches | Blythe, CA | 393 | 32 | - |
| Big Meadows Campground | Sonora, CA | 390 | 29 | - |
| Morning Star Pkg. Co.-Wms. | Los Banos, CA | 390 | 9 | - |
| Stanislaus Union School Dist | Modesto, CA | 390 | 20 | - |
| Spring Creek Tract Association | South Lake Tahoe, CA | 389 | 33 | - |
| Lakeside Elementary School | Hanford, CA | 388 | 36 | - |
| Coast Springs - Cal. Water Service (Puc) | San Jose, CA | 388 | 23 | - |
| Alta Elementary School | Reedley, CA | 387 | 9 | - |
| Valley Estates POA, Inc. | Weldon, CA | 386 | 35 | - |
| Camp Roberts - California National Guard | Camp Roberts, CA | 385 | 16 | - |
| Forest Springs | Boulder Creek, CA | 385 | 267 | - |
| Chatom School (Eh) | Turlock, CA | 385 | 12 | - |
| Monrovia Nursery - Nursery | Woodlake, CA | 385 | 23 | - |
| Ardagh Glass, Inc | Madera, CA | 384 | 70 | - |
| Plavada Community Association | Norden, CA | 384 | 78 | - |
| South Kaweah Mutual Water Company | Three Rivers, CA | 384 | 64 | - |
| Teviston Community Services District | Sacramento, CA | 383 | 22 | - |
| Colusa Co. Wwd #2 - Princeton | Princeton, CA | 382 | 21 | - |
| Sacramento River RV Park | Eugene, CA | 382 | 0 | - |
| Strawberry Lodge MWC | Twin Peaks, CA | 381 | 9 | - |
| Willow Park Marina | Oakley, CA | 380 | 16 | - |