All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Rancho del Oro MHP Amador County |
44 | 0 | 0 | |
|
Rancho Nipomo Water Company San Luis Obispo County |
44 | 0 | 0 | |
|
Rio Ranch Community Svcs Dist Tehama County |
44 | 0 | 0 | |
|
Rombauer Sierra Foothills Amador County |
44 | 0 | 0 | |
|
San Pasqual Battlefield State Park San Diego County |
44 | 0 | 0 | |
|
Stags Leap Wine Cellars Napa County |
44 | 0 | 0 | |
|
Viking RV Park Fresno County |
44 | 2 | 0 | |
|
Aberdeen Water System Inyo County |
43 | 0 | 0 | |
|
Cold Spring Granite CO Raymond Madera County |
43 | 2 | 0 | |
|
Darling Ingredients Turlock Stanislaus County |
43 | 1 | 1 | |
|
Darr Water CO San Bernardino County |
43 | 4 | 1 | |
|
Echo Chalet INC El Dorado County |
43 | 0 | 0 | |
|
Emerald Valley Mutual Water Company Santa Clara County |
43 | 0 | 0 | |
|
Lakeview Apartments Santa Cruz County |
43 | 3 | 1 | |
|
Mesa Grande (tract 2) County |
43 | 1 | 0 | |
|
Rubys Valley Care Home Fresno County |
43 | 1 | 1 | |
|
San Augustin Mutual Water Company Santa Barbara County |
43 | 0 | 0 | |
|
Sce Bishop Creek Plant 5 Bishop · Inyo County |
43 | 0 | 0 | |
|
Sierra Vista Association Tulare County |
43 | 3 | 1 | |
|
ST Francis Yacht Club San Joaquin County |
43 | 0 | 0 | |
|
Teapot Dome Water CO Tulare County |
43 | 0 | 0 | |
|
The Fruit Yard Restaurant Stanislaus County |
43 | 1 | 1 | |
|
Twomey Cellars Napa County |
43 | 0 | 0 | |
|
Wheeler Farms Winery Napa County |
43 | 0 | 0 | |
|
Balletto Vineyards Sonoma County |
42 | 0 | 0 | |
|
Bass Lake Annex 3 Madera County |
42 | 1 | 0 | |
|
Branscomb Mobile Home Park Mendocino County |
42 | 3 | 2 | |
|
Bucktail Mutual Water Company Trinity County |
42 | 3 | 2 | |
|
Caymus Vineyards Napa County |
42 | 1 | 0 | |
|
Chemurgic Agricultural Chemicals, Inc. Stanislaus County |
42 | 2 | 2 | |
|
Childkind Laguna Preschool Sonoma County |
42 | 0 | 0 | |
|
Dardanelles Resort Tuolumne County |
42 | 0 | 0 | |
|
EB Stone Solano County |
42 | 0 | 0 | |
|
Ehlers Estate Napa County |
42 | 0 | 0 | |
|
Gurdwara Parmeshar Dwar Madera · Madera County |
42 | 0 | 0 | |
|
Hopeton School Merced County |
42 | 1 | 0 | |
|
Inn at Park Winters Yolo County |
42 | 0 | 0 | |
|
Kranenburg Water System Kern County |
42 | 0 | 0 | |
|
L'azienda D'agostini Amador County |
42 | 2 | 0 | |
|
Maria Lane Mutual Water Company Santa Clara County |
42 | 0 | 0 | |
|
Meadowridge Mutual Water CO Santa Cruz County |
42 | 0 | 0 | |
|
Millard Canyon Improvement Association Los Angeles County |
42 | 1 | 0 | |
|
MT Ararat Mobile Home Park Fresno County |
42 | 0 | 0 | |
|
Paradise RD WS #05 Monterey County |
42 | 0 | 0 | |
|
Pavestone Yolo County |
42 | 0 | 0 | |
|
Point Cabrillo Highlands Mendocino County |
42 | 0 | 0 | |
|
Rancho Chaparral Mwc Monterey County |
42 | 0 | 0 | |
|
Shady Lane RV Camp San Bernardino County |
42 | 0 | 0 | |
|
Sierra North Community Service District Inyo County |
42 | 1 | 1 | |
|
Slate Mountain HOA Tulare County |
42 | 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.