All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
East Orosi Community Services District Tulare County |
423 | 3 | 2 | |
|
Grand View School Tulare County |
423 | 1 | 1 | |
|
Villa del Monte Mwc Santa Cruz County |
422 | 0 | 0 | |
|
Wente Scout Reservation Mendocino County |
422 | 0 | 0 | |
|
Csp Kirkwood Entrance Santa Cruz County |
421 | 0 | 0 | |
|
Nas North Island & Nab Coronado San Diego County |
421 | 0 | 0 | |
|
Redwood Maint. & Oper. Del Norte County |
421 | 2 | 0 | |
|
Csp-Manchester State Park Mendocino County |
420 | 0 | 0 | |
|
Los Robles Mobile Home Estates San Luis Obispo County |
420 | 0 | 0 | |
|
Santa Rosa Mobile Estates Sonoma County |
420 | 0 | 0 | |
|
Sun Valley Packing Tulare County |
420 | 0 | 0 | |
|
Yosemite West Water System Mariposa County |
420 | 1 | 1 | |
|
Shasta Csa French Gulch, #11 Shasta County |
419 | 1 | 0 | |
|
Big Pine Flats Admin & Recreation San Bernardino County |
417 | 0 | 0 | |
|
Big Valley Rancheria Water District County |
417 | 1 | 0 | |
|
Fcsa 05 Wildwood Island Fresno County |
417 | 0 | 0 | |
|
Shingletown Store Water System Shasta County |
417 | 0 | 0 | |
|
Slide Inn Snowbowl Water CO Tuolumne County |
417 | 1 | 0 | |
|
Island Union School Kings County |
416 | 0 | 0 | |
|
Rancho Oso Santa Barbara County |
416 | 0 | 0 | |
|
Country Hills RV Park Riverside County |
415 | 0 | 0 | |
|
Fess Parker Winery Santa Barbara County |
415 | 0 | 0 | |
|
White Oak Mutual Water Company Shasta County |
415 | 0 | 0 | |
|
Californian Mobile Home Park Los Angeles County |
414 | 0 | 0 | |
|
Sanborn-Skyline County Park Santa Clara County |
414 | 0 | 0 | |
|
Lo-Fi Winery Santa Barbara County |
413 | 1 | 0 | |
|
Yosemite Lakes Campground Tuolumne County |
413 | 1 | 0 | |
|
Delft Colony Water Tulare County |
412 | 0 | 0 | |
|
Hhw&p Moccasin Compound-Sfpuc San Francisco County |
410 | 1 | 0 | |
|
Leisure Mobile Home Park Sonoma County |
410 | 0 | 0 | |
|
Palo Verde County Water Dist. Imperial County |
410 | 4 | 2 | |
|
Sensient Natural Ingredients LLC Merced County |
410 | 0 | 0 | |
|
Tannery Gulch Campground Trinity County |
410 | 0 | 0 | |
|
Round Valley Piner County |
409 | 5 | 1 | |
|
Big Sandy Rancheria Big Sandy Rancheria · County |
408 | 5 | 2 | |
|
San Vicente Water Company Santa Barbara County |
408 | 0 | 0 | |
|
Triple R Mutual Water CO Tulare County |
408 | 1 | 1 | |
|
Christian Life Assembly Water System Kern County |
406 | 0 | 0 | |
|
Forest Park Mwc San Bernardino County |
406 | 3 | 1 | |
|
Sonoma County Csa 41-Jenner Sonoma County |
406 | 0 | 0 | |
|
Camp Cedar Falls San Bernardino County |
405 | 0 | 0 | |
|
General Atomics Aeronautical Gray Butt Los Angeles County |
405 | 0 | 0 | |
|
Lodi Usd-Houston School San Joaquin County |
405 | 0 | 0 | |
|
Csp Red Rock Canyon Kern County |
404 | 0 | 0 | |
|
Joshua Tree NP Black Rock Canyon Riverside County |
404 | 0 | 0 | |
|
Owens-Brockway Glass Container INC San Joaquin County |
404 | 1 | 0 | |
|
Thousand Trails Oakzanita Inc. San Diego County |
404 | 0 | 0 | |
|
JH Ranch Siskiyou County |
403 | 0 | 0 | |
|
Mobile Home Estates Sonoma County |
403 | 2 | 1 | |
|
Snowcrest Heights Imp Assoc San Bernardino County |
403 | 0 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules currently in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.