All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Greenfield, City of Greenfield · Monterey County |
18,967 | 1 | 1 | |
|
South Bay Rod & Gun Club Inc. San Diego County |
18,900 | 1 | 0 | |
|
Laguna Beach County WD Orange County |
18,862 | 0 | 0 | |
|
Arcata, City of Arcata · Humboldt County |
18,857 | 1 | 1 | |
|
Twentynine Palms Water District San Bernardino County |
18,795 | 0 | 0 | |
|
Bella Vista Water District Shasta County |
18,767 | 0 | 0 | |
|
American Canyon, City of American Canyon · Napa County |
18,423 | 1 | 1 | |
|
Rosamond Csd Kern County |
18,150 | 0 | 0 | |
|
California Water Service Co.-Travis Afb Solano County |
18,111 | 0 | 0 | |
|
Thunder Valley Casino County |
18,007 | 1 | 0 | |
|
Butte-Glenn Community College Dist Butte County |
18,000 | 0 | 0 | |
|
Yuba County Motorplex Yuba County |
18,000 | 0 | 0 | |
|
City of Arroyo Grande Utilities Division San Luis Obispo County |
17,963 | 1 | 0 | |
|
Western Mwd Murrieta Division Riverside County |
17,837 | 0 | 0 | |
|
Bakman Water Company Fresno County |
17,393 | 1 | 1 | |
|
Coalinga-City Coalinga · Fresno County |
17,277 | 0 | 0 | |
|
Kerman, City of Kerman · Fresno County |
17,256 | 0 | 0 | |
|
Nevada ID E. George, Banner Mountain Nevada County |
17,154 | 0 | 0 | |
|
McKinleyville C.s.d. Humboldt County |
16,900 | 0 | 0 | |
|
Orange Vale Water Company Sacramento County |
16,861 | 0 | 0 | |
|
Bishop Creek Chevron Bishop · Inyo County |
16,793 | 0 | 0 | |
|
Town of Discovery Bay Contra Costa County |
16,790 | 0 | 0 | |
|
EL Segundo-City, Water Dept. El Segundo · Los Angeles County |
16,777 | 0 | 0 | |
|
Pinedale County Water District Fresno County |
16,736 | 1 | 0 | |
|
Olivehurst Public Utility District Yuba County |
16,595 | 0 | 0 | |
|
Fillmore Water Dept Ventura County |
16,419 | 1 | 0 | |
|
Carpinteria Valley Water District Santa Barbara County |
16,356 | 0 | 0 | |
|
City of Cupertino Cupertino · Santa Clara County |
16,336 | 0 | 0 | |
|
Walnut Park Mutual Water Co. Los Angeles County |
16,180 | 1 | 0 | |
|
Cal AM Fruitridge Vista Sacramento County |
16,075 | 0 | 0 | |
|
Ukiah, City of Ukiah · Mendocino County |
16,067 | 1 | 1 | |
|
Usmc 29 Palms San Bernardino County |
16,067 | 0 | 0 | |
|
Morongo County |
16,000 | 0 | 0 | |
|
City of la Palma La Palma · Orange County |
15,948 | 0 | 0 | |
|
Ripon, City of Ripon · San Joaquin County |
15,753 | 0 | 0 | |
|
Rio Linda/elverta Community Water Dist Sacramento County |
15,460 | 0 | 0 | |
|
Huntington Park-City, Water Dept. Huntington Park · Los Angeles County |
15,437 | 0 | 0 | |
|
City of Crescent City Crescent City · Del Norte County |
15,202 | 0 | 0 | |
|
South Montebello Irrigation Dist. Los Angeles County |
15,021 | 0 | 0 | |
|
California Mens Colony San Luis Obispo County |
15,000 | 0 | 0 | |
|
Caltrans-Maxwell Reststops Colusa County |
15,000 | 0 | 0 | |
|
American Water O&m, LLC Vsfb Santa Barbara County |
14,971 | 0 | 0 | |
|
Sbdno County Service Area 64 San Bernardino County |
14,955 | 0 | 0 | |
|
City of Livingston Livingston · Merced County |
14,894 | 1 | 1 | |
|
City of Modesto Salida Modesto · Stanislaus County |
14,576 | 0 | 0 | |
|
City of Parlier Parlier · Fresno County |
14,576 | 1 | 1 | |
|
City of Red Bluff Red Bluff · Tehama County |
14,286 | 0 | 0 | |
|
Pala North County |
14,280 | 3 | 1 | |
|
California City, City of California City · Kern County |
14,198 | 1 | 1 | |
|
McFarland, City of Mcfarland · Kern County |
14,161 | 3 | 1 |
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.