All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Lsid Tonyville Tulare County |
500 | 3 | 2 | |
|
Lsid-Strathmore System Tulare County |
500 | 2 | 2 | |
|
Marysville Flea Market Yuba County |
500 | 1 | 0 | |
|
Mendocino County Fairgrounds Mendocino County |
500 | 0 | 0 | |
|
Millpond Recreation Area Inyo County |
500 | 1 | 0 | |
|
Mira Loma High Desert Hospital Los Angeles County |
500 | 0 | 0 | |
|
Mohi at the Grove San Benito County |
500 | 0 | 0 | |
|
Mystery Spot Snack Shack Santa Cruz County |
500 | 0 | 0 | |
|
Oak Grove School Sonoma County |
500 | 1 | 1 | |
|
Oak Tree Mountain San Bernardino County |
500 | 1 | 0 | |
|
Palo Verde Union Elementary School Tulare County |
500 | 0 | 0 | |
|
Pilot Knob RV Resort Imperial County |
500 | 0 | 0 | |
|
Prairie Creek Sp-State Parks Humboldt County |
500 | 0 | 0 | |
|
River Oak Grace-Water System Stanislaus County |
500 | 1 | 0 | |
|
River Oaks/kingdom Hall Stanislaus County |
500 | 0 | 0 | |
|
Sierra Pines Church Madera · Madera County |
500 | 0 | 0 | |
|
Sierra Tahoe Grandview El Dorado County |
500 | 2 | 0 | |
|
Silver Lake Campground Amador County |
500 | 1 | 0 | |
|
Sommerville Almond Tree Owners Assn Fresno County |
500 | 0 | 0 | |
|
ST Joseph's Church Yolo County |
500 | 0 | 0 | |
|
Starlite Pines Mutual Water CO INC Shasta County |
500 | 0 | 0 | |
|
Sterling Vineyards Napa County |
500 | 0 | 0 | |
|
The Anderson Cayucos · San Luis Obispo County |
500 | 0 | 0 | |
|
Tract 92 Community Services District Tulare County |
500 | 1 | 1 | |
|
Tulare CO Correctional Center Road Camp Tulare County |
500 | 1 | 1 | |
|
Usfs Wheeler Gorge Campground Ventura County |
500 | 0 | 0 | |
|
Usfs French Meadows North Shore Placer County |
500 | 0 | 0 | |
|
Usfs French Meadows South Shore Placer County |
500 | 0 | 0 | |
|
Valley Pacific Petroleum Services Santa Barbara County |
500 | 0 | 0 | |
|
Visalia Sales Yard Tulare County |
500 | 1 | 0 | |
|
Whitney Portal Inyo County |
500 | 0 | 0 | |
|
Yosemite Nps-Crane Flat Mariposa County |
500 | 0 | 0 | |
|
Hidden Valley Community Association Placer County |
499 | 0 | 0 | |
|
Lakeview Hills Community Assoc Placer County |
499 | 0 | 0 | |
|
Valley View Park Mwc San Bernardino County |
499 | 1 | 1 | |
|
Broadview Terrace Mutual Water Company Madera County |
498 | 1 | 0 | |
|
Airstreams Renewables Kern County |
495 | 0 | 0 | |
|
Hhw&p-O'shaughnessy Dam Cpd-Sfpuc San Francisco County |
495 | 0 | 0 | |
|
Rough Acres Foundation San Diego County |
495 | 1 | 0 | |
|
The Lakes Association Tulare County |
495 | 0 | 0 | |
|
Westside Park Mutual Water Los Angeles County |
495 | 0 | 0 | |
|
Agua Dulce Water System Los Angeles County |
493 | 0 | 0 | |
|
Miranda C.s.d. Humboldt County |
492 | 0 | 0 | |
|
Sky Forest Mwc San Bernardino County |
492 | 2 | 1 | |
|
Angeles Shooting Ranges Los Angeles County |
490 | 0 | 0 | |
|
Pacific Union Elementary School Fresno County |
490 | 0 | 0 | |
|
Westhaven C.s.d. Humboldt County |
490 | 1 | 0 | |
|
Tuff Campground Mono County |
489 | 0 | 0 | |
|
Middletown Rancheria Community Water System County |
487 | 4 | 3 | |
|
Rancheritos Mwc San Bernardino County |
487 | 1 | 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.