Nitrate violations in California
524 active public water systems in California had a Nitrate violation in the past three years, 41 of them in the latest quarter of EPA's data. What Nitrate is and why it matters.
Systems with a Nitrate violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Evergreen Lodge Tuolumne County |
30 | 2 | 0 | |
|
Huntington Lake Resort Fresno County |
30 | 2 | 0 | |
|
Huppe Moore Landscape Placer County |
30 | 1 | 0 | |
|
Keenwild Station Usfs Riverside County |
30 | 1 | 0 | |
|
Laureate Water Company San Luis Obispo County |
30 | 1 | 0 | |
|
Live Oak Creek Mutual Water Company Santa Clara County |
30 | 1 | 0 | |
|
Mammoth Pool Mobile Home Park Madera County |
30 | 2 | 1 | |
|
Pyramid Flowers Ventura County |
30 | 1 | 0 | |
|
Richardson Beardsley Park Inc. San Diego County |
30 | 1 | 0 | |
|
Tehachapi Valley United Methodist Church Kern County |
30 | 1 | 0 | |
|
Vista Grande Station Usfs Riverside County |
30 | 2 | 1 | |
|
YMCA Camp Whittle San Bernardino County |
30 | 1 | 0 | |
|
Yolo Fruit Stand Water Yolo County |
30 | 2 | 0 | |
|
Country Inn, the Napa County |
29 | 1 | 0 | |
|
Green Acres Mobile Park Riverside County |
29 | 1 | 0 | |
|
Camp la Verne San Bernardino County |
28 | 2 | 0 | |
|
Church of Glad Tidings Sutter County |
28 | 2 | 0 | |
|
Santa Cruz Mountain Pure WC Santa Cruz County |
28 | 1 | 0 | |
|
Belmont Temperance Property Water System Fresno County |
27 | 2 | 0 | |
|
David Bruce Winery Santa Cruz County |
27 | 1 | 0 | |
|
Houseboat Mini Mart Tuolumne County |
27 | 1 | 0 | |
|
Jarvis Vineyard Napa County |
27 | 1 | 0 | |
|
McHenry Business Park Stanislaus County |
27 | 2 | 1 | |
|
White Rock Club WS Monterey County |
27 | 1 | 0 | |
|
Borjon Winery Amador County |
26 | 2 | 0 | |
|
Caltrans, Sand Hill Rest Stop Imperial County |
26 | 1 | 0 | |
|
Eastin Stanislaus County |
26 | 2 | 0 | |
|
Farmers' Den /market Stanislaus County |
26 | 1 | 0 | |
|
Hamlet Motel Stanislaus County |
26 | 1 | 0 | |
|
Harrington RD WS #07 Monterey County |
26 | 2 | 1 | |
|
LA Casa Loma River Store Tuolumne County |
26 | 1 | 0 | |
|
Lawler Park Riv.county Parks Riverside County |
26 | 1 | 0 | |
|
Pinecrest Elementary School Tuolumne County |
26 | 3 | 1 | |
|
Shiloh-Paradise Baseball for Youth Stanislaus County |
26 | 1 | 0 | |
|
141 Suburban Road Water Supply San Luis Obispo County |
25 | 1 | 0 | |
|
Antinori California Napa · Napa County |
25 | 1 | 0 | |
|
Bagdad Cafe San Bernardino County |
25 | 2 | 0 | |
|
Barn the San Bernardino County |
25 | 2 | 0 | |
|
Beverly Lodge El Dorado County |
25 | 2 | 0 | |
|
Burgess Cellars Napa County |
25 | 1 | 0 | |
|
Caltrans, Buckman Springs Rest Area San Diego County |
25 | 1 | 0 | |
|
Ciotti Cellars Placer County |
25 | 2 | 0 | |
|
Circle Bar B Guest Ranch Santa Barbara County |
25 | 1 | 0 | |
|
Circle K Ranch Fresno County |
25 | 1 | 0 | |
|
Crab Flats Campground San Bernardino County |
25 | 1 | 0 | |
|
Everybody's Inn Placer County |
25 | 2 | 0 | |
|
Exxon Station WS Monterey County |
25 | 1 | 0 | |
|
Fenders San Bernardino County |
25 | 2 | 0 | |
|
Gables Water Company San Bernardino County |
25 | 1 | 0 | |
|
Garlic World Santa Clara County |
25 | 1 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Nitrate, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Nitrate alone.
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.