All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Z D Wines Napa County |
95 | 0 | 0 | |
|
Mayflower Park Riverside County |
94 | 1 | 0 | |
|
Bella Vista Water Sys Contra Costa County |
93 | 3 | 2 | |
|
Cal AM Coarsegold Madera County |
93 | 0 | 0 | |
|
Lomas del Sol Mws Monterey County |
93 | 1 | 1 | |
|
Lytton Springs Winery Sonoma County |
93 | 0 | 0 | |
|
Michele Mutual Water Company Sonoma County |
93 | 0 | 0 | |
|
Monterey One Water Monterey County |
93 | 0 | 0 | |
|
Randal's Ranchette Mutual Water Company Sonoma County |
93 | 2 | 2 | |
|
Redwoods Main Water System Mariposa County |
93 | 0 | 0 | |
|
San Miguel WS #22 Monterey County |
93 | 1 | 1 | |
|
Cal AM Water Company Ralph Lane Monterey County |
92 | 0 | 0 | |
|
Cortland Pines Mutual Water CO Shasta County |
92 | 0 | 0 | |
|
LE Cuvier Winery Cayucos · San Luis Obispo County |
92 | 0 | 0 | |
|
Leisure Time RV Park Mendocino County |
92 | 0 | 0 | |
|
Maurland Manor Water System San Joaquin County |
92 | 0 | 0 | |
|
McCoy RD WS #05 Monterey County |
92 | 1 | 0 | |
|
Nishi Quality Flowers, Inc. Ventura County |
92 | 1 | 1 | |
|
Oak Manor WS Monterey County |
92 | 1 | 1 | |
|
Rapid River Mobilehome Park Shasta County |
92 | 2 | 1 | |
|
Robley Property Mws Monterey County |
92 | 1 | 1 | |
|
Spanish Flat Water District Napa County |
92 | 2 | 1 | |
|
Tud-Peaceful Pines Water System Tuolumne County |
92 | 1 | 0 | |
|
Vista del Toro WS Monterey County |
92 | 2 | 1 | |
|
Wonder Acres Water System Kern County |
92 | 1 | 1 | |
|
Adm Rice Inc. Colusa County |
91 | 0 | 0 | |
|
Davis Migrant Center (ciudad del Sol) Yolo County |
91 | 1 | 1 | |
|
Ebrpd Sunol Regional Wilderness Alameda County |
91 | 0 | 0 | |
|
Encinal RD WS #01 Monterey County |
91 | 3 | 1 | |
|
Greenheart Farms San Luis Obispo County |
91 | 0 | 0 | |
|
Hawkins Water Co-Cal Water Service (puc) Sonoma County |
91 | 0 | 0 | |
|
Livingston Properties Merced County |
91 | 1 | 0 | |
|
Saucelito Elementary School Tulare County |
91 | 0 | 0 | |
|
The Madrones Mendocino County |
91 | 0 | 0 | |
|
Acton Conservation Camp #11 Los Angeles County |
90 | 4 | 0 | |
|
Airport Industrial Park Shasta County |
90 | 0 | 0 | |
|
Anza Pines Mobile Home Park Riverside County |
90 | 0 | 0 | |
|
B K Lighting INC Madera County |
90 | 2 | 0 | |
|
Blue Lakes Improvement Club Lake County |
90 | 1 | 1 | |
|
Blue Spruce Mobile Home Park Sonoma County |
90 | 0 | 0 | |
|
Bridgeport Reservoir Marina and CG Mono County |
90 | 0 | 0 | |
|
Calwest Rain Kerman Fresno County |
90 | 0 | 0 | |
|
Camp Timberwolf Plumas County |
90 | 0 | 0 | |
|
Clark Street Community Well Kern County |
90 | 3 | 3 | |
|
Coe Orchard Equipment Sutter County |
90 | 1 | 0 | |
|
Gooselake Water Company Kern County |
90 | 0 | 0 | |
|
Historic Priest Station, LLC Tuolumne County |
90 | 2 | 0 | |
|
Jahant Woods Cellars San Joaquin County |
90 | 0 | 0 | |
|
Lake Shasta Pines RV Park & Campground Shasta County |
90 | 2 | 1 | |
|
Lake View Mutual Water Co. Mendocino County |
90 | 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.