All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Sierra Highland Csd Inyo County |
600 | 1 | 0 | |
|
Stagecoach Trails RV Resort San Diego County |
600 | 2 | 0 | |
|
Madison Elementary School Fresno County |
597 | 0 | 0 | |
|
Waterford Hickman Modesto · Stanislaus County |
597 | 0 | 0 | |
|
S & T Mutual Water Company San Luis Obispo County |
591 | 0 | 0 | |
|
Golden State Water CO Lucerne San Bernardino County |
590 | 0 | 0 | |
|
Bonita School Santa Barbara County |
589 | 0 | 0 | |
|
Csp-Bothe-Napa Valley State Park Napa County |
586 | 0 | 0 | |
|
Carmel Riviera Mwc Monterey County |
584 | 0 | 0 | |
|
Stinson Beach County Wtr Dist Marin County |
583 | 0 | 0 | |
|
Mount Laguna Improvement Assn. San Diego County |
580 | 1 | 1 | |
|
Roosevelt Elementary School Fresno County |
580 | 0 | 0 | |
|
Echo Valley School WS Monterey County |
579 | 1 | 0 | |
|
Mendocino School District Mendocino Mendocino County |
579 | 0 | 0 | |
|
Seventh Day Adventist Camp Santa Cruz County |
578 | 0 | 0 | |
|
San Ardo WD Monterey County |
575 | 1 | 1 | |
|
Usfs/vermillion Campground Fresno County |
575 | 1 | 0 | |
|
River Pines Pud Amador County |
574 | 1 | 1 | |
|
Mid MC Swain Rec Area Mariposa County |
573 | 0 | 0 | |
|
Bear River Lake Resort Amador County |
571 | 2 | 0 | |
|
Blythe Mesa Ranch Riverside County |
568 | 0 | 0 | |
|
MD 33 Fairmead Madera County |
568 | 0 | 0 | |
|
Banning Hts. Mutual Water Co. Riverside County |
567 | 1 | 0 | |
|
Planada Elementaryschool Merced County |
567 | 1 | 1 | |
|
Juvenile Justice Campus Fresno County |
565 | 1 | 0 | |
|
Lake Forest Mutual W.c. Lassen County |
565 | 0 | 0 | |
|
Apple Market Two Riverside County |
561 | 0 | 0 | |
|
Jacumba Community SD San Diego County |
561 | 1 | 0 | |
|
Glen Eden Sun Club Riverside County |
560 | 0 | 0 | |
|
Little Potato Slough Mutual San Joaquin County |
560 | 0 | 0 | |
|
North Kaweah Mutual Water Company Tulare County |
560 | 0 | 0 | |
|
Odd Fellows Recreation Club Sonoma County |
557 | 0 | 0 | |
|
Pleasant Grove Elementary School Sacramento County |
553 | 1 | 0 | |
|
Van Duzen Humboldt Co. Parks Humboldt County |
551 | 0 | 0 | |
|
Harbor View Mutual Water Company Lake County |
550 | 1 | 1 | |
|
Hughes-Elizabeth Lake Unified School Dis Los Angeles County |
550 | 2 | 1 | |
|
Meadows Union Elementary School Imperial County |
550 | 4 | 2 | |
|
Mission Oaks Mobile Home Park San Benito County |
550 | 0 | 0 | |
|
Pacific Scientific Energetic Mats. Comp. San Benito County |
550 | 0 | 0 | |
|
Patterson Tract Csd Tulare County |
550 | 1 | 0 | |
|
Rio School Dist/ Rio Real School Ventura County |
550 | 0 | 0 | |
|
Sun Empire School Fresno County |
550 | 1 | 0 | |
|
Vineyard RV Park Solano County |
550 | 0 | 0 | |
|
Clayton Palms Water Contra Costa County |
549 | 1 | 1 | |
|
Calpella County Water District Mendocino County |
548 | 0 | 0 | |
|
Golden State Water Company Lake Marie Santa Barbara County |
548 | 0 | 0 | |
|
Fuller Acres Mutual Water Company Kern County |
545 | 0 | 0 | |
|
Llano del Rio Water Company Los Angeles County |
545 | 1 | 1 | |
|
Chiriaco Summit Water Dist. Riverside County |
544 | 1 | 0 | |
|
Rio Vista Mobile Home Park Tehama County |
543 | 1 | 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.