All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Fcwwd 18/friant Fresno County |
909 | 1 | 0 | |
|
Del Oro Water Co.-Johnson Park Shasta County |
908 | 0 | 0 | |
|
Kings River Hardwick School Kings County |
908 | 0 | 0 | |
|
Pinon Pines Mwc Kern County |
908 | 1 | 1 | |
|
Usfs/rancheria Campground Fresno County |
906 | 0 | 0 | |
|
Bud Antle, Llc-Soledad Facility WS Monterey County |
900 | 0 | 0 | |
|
Fern Valley WD Riverside County |
900 | 0 | 0 | |
|
Nps-Dorst CG Tulare County |
900 | 0 | 0 | |
|
Usfs/dorabelle Campground Fresno County |
900 | 0 | 0 | |
|
Valley Springs Pud Calaveras County |
900 | 1 | 0 | |
|
Windset Farms Greenhouses Santa Barbara County |
900 | 0 | 0 | |
|
Rancho Pauma Mutual WC San Diego County |
899 | 1 | 0 | |
|
Lakeside School Kern County |
897 | 2 | 1 | |
|
California Water Service Co-Leona Valley Los Angeles County |
895 | 0 | 0 | |
|
Mammoth Mountain Ski Area Outpost 14 Mono County |
891 | 0 | 0 | |
|
South Midway City Mutual Water Co. Midway City · Orange County |
891 | 0 | 0 | |
|
Dorris, City of Dorris · Siskiyou County |
887 | 1 | 1 | |
|
Hillsview Homes Stanislaus County |
887 | 1 | 0 | |
|
Plantation on the Lake Park Riverside County |
885 | 0 | 0 | |
|
Psmcsd Sunny Mesa Monterey County |
880 | 0 | 0 | |
|
Madison Service Dist Yolo County |
876 | 8 | 1 | |
|
Lake of the Woods Mwc Kern County |
875 | 0 | 0 | |
|
Alpaugh Community Services District Tulare County |
871 | 0 | 0 | |
|
Descanso Community Water District San Diego County |
870 | 3 | 1 | |
|
Usfs Tillie Creek Live Oaks Campgrounds Kern County |
865 | 0 | 0 | |
|
Cuesta la Honda Guild INC San Mateo County |
863 | 0 | 0 | |
|
Mesa Elementary School Stanislaus County |
860 | 0 | 0 | |
|
Juniper Riviera Cwd San Bernardino County |
858 | 2 | 1 | |
|
Refugio State Beach Santa Barbara County |
857 | 0 | 0 | |
|
Joshua Tree NP Cottonwood Springs Riverside County |
856 | 0 | 0 | |
|
Forks Resort Madera County |
853 | 0 | 0 | |
|
McKinney Water District Placer County |
853 | 1 | 0 | |
|
San Joaquin County Wilkinson Manor San Joaquin County |
851 | 0 | 0 | |
|
Camp Lotus Water System El Dorado County |
850 | 1 | 0 | |
|
Coyote Valley System County |
850 | 5 | 0 | |
|
West Valley High School Shasta County |
850 | 0 | 0 | |
|
William Heise County Park San Diego County |
850 | 1 | 0 | |
|
Los Prietos Complex Santa Barbara County |
845 | 1 | 0 | |
|
Apple Valley Foothill Cwd San Bernardino County |
841 | 2 | 2 | |
|
First Mace Meadow # 1 Amador County |
838 | 1 | 1 | |
|
Tahoe City Pud Tahoe Swiss Village Placer County |
837 | 0 | 0 | |
|
Oasis Date Gardens Riverside County |
832 | 2 | 1 | |
|
Herlong Public Utility District Lassen County |
831 | 0 | 0 | |
|
Tud-Apple Valley Estates Tuolumne County |
829 | 1 | 0 | |
|
Canon Manor Water System Sonoma County |
828 | 0 | 0 | |
|
Loleta C.s.d. Humboldt County |
828 | 0 | 0 | |
|
Oasis Mobile Home Park County |
826 | 2 | 0 | |
|
Del Sur School/westside Union District Los Angeles County |
825 | 1 | 0 | |
|
Wal*mart Dist. Ctr/eco Res Tehama County |
825 | 1 | 1 | |
|
Sacramento Nat. Wildlife Refuge Glenn County |
824 | 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.