All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Walnut Hills Mutual Water CO San Luis Obispo County |
486 | 0 | 0 | |
|
Jefferson Esd-Jefferson School San Joaquin County |
483 | 1 | 1 | |
|
Summit West Mutual Water Co. Santa Cruz County |
481 | 1 | 1 | |
|
Willow Mobile Home Park Contra Costa County |
481 | 0 | 0 | |
|
Dillard Elementary School Sacramento County |
478 | 2 | 0 | |
|
EL Dorado ID Outingdale El Dorado County |
478 | 0 | 0 | |
|
Lassen Pines Mutual Water CO INC Shasta County |
475 | 1 | 1 | |
|
Lytle Springs WC San Bernardino County |
475 | 0 | 0 | |
|
Berryessa Estates (lbrid) Napa County |
474 | 0 | 0 | |
|
Csa 70 W-4 Pioneertown San Bernardino County |
474 | 0 | 0 | |
|
McUsd Woodland Elementary School Mariposa County |
474 | 0 | 0 | |
|
Riverland Resort San Bernardino County |
470 | 1 | 0 | |
|
Tehachapi Church of the Nazarene Kern County |
469 | 0 | 0 | |
|
U.s. Coast Guard Training Center Sonoma County |
469 | 1 | 1 | |
|
Belleview Oaks Mutual Water CO Tuolumne County |
468 | 1 | 0 | |
|
Dwr-Monument Hill Restrooms Butte County |
468 | 0 | 0 | |
|
Fcsa 32 Cantua Creek Fresno County |
468 | 0 | 0 | |
|
Glenwood Mobile Estates Inyo County |
468 | 1 | 1 | |
|
Vista Grande Water System Tehama County |
468 | 1 | 1 | |
|
Arcohe Elem School Main Campus Sacramento County |
465 | 0 | 0 | |
|
Canyon Meadows Mutual Water Kern County |
465 | 2 | 1 | |
|
Newberry Mini Mart and Truck Stop San Bernardino County |
465 | 0 | 0 | |
|
Ripon Usd-Colony Oak School San Joaquin County |
465 | 0 | 0 | |
|
Alturas Desert Rose Casino Alturas · County |
464 | 2 | 1 | |
|
Pence Vineyards Lompoc · Santa Barbara County |
463 | 0 | 0 | |
|
Brock Mutual Water Company Kern County |
462 | 0 | 0 | |
|
San Simeon Csd San Luis Obispo County |
462 | 1 | 0 | |
|
Fallen Leaf Mutual Water CO El Dorado County |
461 | 0 | 0 | |
|
Clarksburg Middle School Yolo County |
460 | 0 | 0 | |
|
Gridley Farm Labor Housing Butte County |
460 | 2 | 0 | |
|
Rincon Valley Mobile Estates Sonoma County |
460 | 1 | 1 | |
|
Willowside School Sonoma County |
460 | 1 | 1 | |
|
Point Arena Water Works Mendocino County |
459 | 1 | 1 | |
|
Trailer Haven Mobile Home Park Alameda County |
459 | 0 | 0 | |
|
Kennedy Grocery Riverside County |
458 | 1 | 0 | |
|
Centerville School Fresno County |
456 | 1 | 0 | |
|
Buena Vista Migrant Center Santa Cruz County |
455 | 0 | 0 | |
|
Cloverdale Mutual Water Co. Ventura County |
455 | 1 | 0 | |
|
Cuyamaca SP Green Valley San Diego County |
455 | 0 | 0 | |
|
Loma Linda University San Bernardino County |
455 | 0 | 0 | |
|
Dunlap K-8 School Fresno County |
453 | 0 | 0 | |
|
Delhi Kingdom Hall Merced County |
452 | 0 | 0 | |
|
Wind Wolves Preserve Kern County |
452 | 0 | 0 | |
|
Buttonwillow Raceway Park Classic Kern County |
451 | 0 | 0 | |
|
Camp Saratoga Santa Clara County |
450 | 0 | 0 | |
|
Cbuso Mission Bell Madera County |
450 | 0 | 0 | |
|
Ceres Unified/westport School Stanislaus County |
450 | 2 | 0 | |
|
Clark Pacific CR 18c Yolo County |
450 | 0 | 0 | |
|
Clark System Trinity County |
450 | 0 | 0 | |
|
Colusa Co. Service Area #1-Century Ranch Colusa County |
450 | 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.