All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
White Fence Farms Mwc No.3 Los Angeles County |
749 | 0 | 0 | |
|
Deer Lodge Water System San Bernardino County |
745 | 0 | 0 | |
|
Victory Mutual Water Company Kern County |
740 | 0 | 0 | |
|
Graeagle Water Company Plumas County |
737 | 0 | 0 | |
|
Los Angeles Cwwd 21-Kagel Canyon Los Angeles County |
736 | 0 | 0 | |
|
Christopher Ranch L.l.c. Santa Clara County |
735 | 0 | 0 | |
|
High Valleys Water District Riverside County |
733 | 3 | 1 | |
|
California Water Service Co-Lake Hughes Los Angeles County |
732 | 0 | 0 | |
|
Lone Star School Fresno County |
732 | 0 | 0 | |
|
Navarra Water System San Joaquin County |
730 | 0 | 0 | |
|
Plasse's Resort Amador County |
730 | 1 | 0 | |
|
Trinity Center M.w.c. Trinity County |
729 | 1 | 1 | |
|
Sierra Csa #5, Sierra Brooks Sierra County |
726 | 1 | 0 | |
|
Lucerne Valley Elementary School San Bernardino County |
724 | 0 | 0 | |
|
EL Tejon Middle School Kern County |
722 | 0 | 0 | |
|
Etna, City of Etna · Siskiyou County |
720 | 1 | 1 | |
|
Kingdom Hall of Jehovah S Witnesses Fresno County |
720 | 1 | 0 | |
|
Sierra High School Fresno County |
720 | 1 | 1 | |
|
Big Trees Campground Inyo County |
719 | 0 | 0 | |
|
Lacsd Rimforest San Bernardino County |
717 | 0 | 0 | |
|
Cws Tulco Water Company Tulare County |
716 | 0 | 0 | |
|
Berryessa Highlands Napa County |
715 | 1 | 0 | |
|
Coso Junction Ranch Store Inyo County |
715 | 0 | 0 | |
|
Ingomar Packing Merced County |
715 | 0 | 0 | |
|
KOA Petaluma Sonoma County |
713 | 0 | 0 | |
|
A.f.p. Mutual Water Company Kern County |
710 | 0 | 0 | |
|
Csp Ano Nuevo State Park San Mateo County |
709 | 0 | 0 | |
|
Lake Hemet-Garner Valley Riverside County |
709 | 0 | 0 | |
|
Hamilton School Riverside County |
705 | 0 | 0 | |
|
San Pasqual District B County |
705 | 0 | 0 | |
|
Urj Camp Newman Sonoma County |
705 | 0 | 0 | |
|
Moonlight Packing Company Plant 7 Fresno County |
703 | 0 | 0 | |
|
Stockton Verde Mobile Home Park San Joaquin County |
703 | 0 | 0 | |
|
Anderson Union High School Shasta County |
700 | 1 | 1 | |
|
Black Butte Lake, Buckhorn Ra, Uscoe Tehama County |
700 | 0 | 0 | |
|
Cuyama Community Services District Santa Barbara County |
700 | 1 | 0 | |
|
Del Rio Mutual Los Angeles County |
700 | 1 | 1 | |
|
Junction School District Shasta County |
700 | 1 | 1 | |
|
MC Clellan MHP Sacramento County |
700 | 1 | 0 | |
|
Rainbo Beach San Bernardino County |
700 | 2 | 0 | |
|
Spartan Veterinary Services Riverside County |
700 | 1 | 0 | |
|
Elkhorn School WS Monterey County |
694 | 0 | 0 | |
|
Linnell Farm Labor Center Tulare County |
694 | 0 | 0 | |
|
Yuima Municipal Water District Ida San Diego County |
693 | 0 | 0 | |
|
Cuyamaca SP Paso Picacho San Diego County |
691 | 0 | 0 | |
|
Moon Valley Water System Sonoma County |
691 | 0 | 0 | |
|
Seville Water Company Tulare County |
691 | 1 | 1 | |
|
Cal American Yerba Buena Ventura County |
690 | 0 | 0 | |
|
Cws Lower Bodfish Water System Kern County |
689 | 0 | 0 | |
|
Hemlock Mutual Water Co. Los Angeles County |
686 | 2 | 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.