All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Central Water District Santa Cruz County |
2,726 | 0 | 0 | |
|
Csp Hollister Hills Svra San Benito County |
2,719 | 0 | 0 | |
|
City of Alturas Alturas · Modoc County |
2,715 | 1 | 1 | |
|
Bertsch Ocean View Csd Del Norte County |
2,669 | 0 | 0 | |
|
Strathmore Public Util Dist Tulare County |
2,669 | 0 | 0 | |
|
Calif State Polytechnical Univ Pomona Los Angeles County |
2,668 | 2 | 1 | |
|
Weed, City of Weed · Siskiyou County |
2,662 | 2 | 2 | |
|
Terra Bella Irrigation District Tbt Tulare County |
2,656 | 1 | 0 | |
|
Arrowhead Villas Mutual Service Company San Bernardino County |
2,644 | 0 | 0 | |
|
Caruthers Comm Serv Dist Fresno County |
2,613 | 0 | 0 | |
|
Caltrans-Red Bluff Rest-Nb Tehama County |
2,600 | 0 | 0 | |
|
Rio Mesa High School/oxnard Uhs Ventura County |
2,600 | 1 | 1 | |
|
Tuolumne Black Oak Casino County |
2,600 | 2 | 0 | |
|
Fulton Water Company Placer County |
2,593 | 1 | 1 | |
|
Frazier Park Pud Kern County |
2,592 | 0 | 0 | |
|
Pine Valley Mutual WC San Diego County |
2,574 | 1 | 0 | |
|
Smith River C.s.d. Del Norte County |
2,568 | 1 | 1 | |
|
Cayucos Beach Mutual Water Company San Luis Obispo County |
2,567 | 0 | 0 | |
|
Flying J Travel Center Los Angeles County |
2,565 | 0 | 0 | |
|
Caltrans Camp Roberts Rsra SB Monterey County |
2,560 | 1 | 0 | |
|
Tule River Reservation Main Tule River Reservation · County |
2,560 | 9 | 2 | |
|
Rogina Water Company Inc. Mendocino County |
2,554 | 1 | 1 | |
|
Caltrans-O'brien Srra Shasta County |
2,550 | 0 | 0 | |
|
Tipton Community Services Dist Tulare County |
2,543 | 0 | 0 | |
|
Alpine Water Users Association San Bernardino County |
2,534 | 0 | 0 | |
|
Kern Valley Airport Kern County |
2,507 | 0 | 0 | |
|
Millerton Sra Meadow Tank Hill Madera County |
2,506 | 0 | 0 | |
|
Jimmys One Stop San Joaquin County |
2,505 | 0 | 0 | |
|
Dierberg/star Lane Vineyard Santa Barbara County |
2,502 | 0 | 0 | |
|
Agate Bay Water Company Placer County |
2,500 | 2 | 1 | |
|
Caltrans-Hillcrest Srra Shasta County |
2,500 | 0 | 0 | |
|
Caltrans-Red Bluff Rest-Sb Tehama County |
2,500 | 0 | 0 | |
|
Erskine Creek WC Kern County |
2,500 | 0 | 0 | |
|
Metro Air Park Water System Sacramento County |
2,500 | 2 | 2 | |
|
O'connor Hospital Santa Clara County |
2,500 | 2 | 1 | |
|
Schoepe Scout Reservation at Lost Valley San Diego County |
2,500 | 0 | 0 | |
|
Valley Children's Hospital Madera County |
2,500 | 0 | 0 | |
|
Yosemite Nps-Tuolumne Meadows Tuolumne County |
2,500 | 0 | 0 | |
|
Valley of Enchantment Mwc San Bernardino County |
2,471 | 1 | 1 | |
|
Cedarpines Park Mwc San Bernardino County |
2,458 | 0 | 0 | |
|
Western Digital Technologies, Inc. Santa Clara County |
2,439 | 0 | 0 | |
|
Horton Creek Campground Inyo County |
2,405 | 0 | 0 | |
|
Awa Camanche Village Amador County |
2,402 | 0 | 0 | |
|
Terwilliger Association Riverside County |
2,401 | 0 | 0 | |
|
Riley's Farm San Bernardino County |
2,400 | 1 | 0 | |
|
Terrace Water Company San Bernardino County |
2,400 | 0 | 0 | |
|
Twain Harte Community Services District Tuolumne County |
2,378 | 1 | 0 | |
|
Cws Kernville Kern County |
2,376 | 0 | 0 | |
|
Clearlake Oaks County Water District Lake County |
2,359 | 1 | 0 | |
|
San Juan Bautista, City of San Juan Bautista · San Benito County |
2,335 | 1 | 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.