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 |
|---|---|---|---|---|
|
Yolo Bypass Wildlife Area Yolo County |
62 | 1 | 0 | |
|
Buckhorn Camp Riverside County |
61 | 1 | 0 | |
|
Pit River XL Rancheria Pit River Tribe · County |
61 | 6 | 0 | |
|
Aguirre MHP County |
60 | 10 | 0 | |
|
Mid Valley Nut CO Hughson · Stanislaus County |
60 | 3 | 2 | |
|
Mariscos la Langosta Water System Tulare County |
60 | 2 | 0 | |
|
Usfs Sandbar Flat Campgd Tuolumne County |
60 | 1 | 0 | |
|
Pnp Stockton #80 San Joaquin County |
59 | 1 | 0 | |
|
Thimio Mwc Monterey County |
59 | 1 | 0 | |
|
Black Bear Lodge El Dorado County |
58 | 2 | 0 | |
|
Dakota Shy Winery Napa County |
58 | 1 | 0 | |
|
Delight's Hot Springs Resort Inyo County |
58 | 1 | 0 | |
|
Villa Shores County |
58 | 2 | 1 | |
|
Cahuilla Mountain Market & Cafe Riverside County |
57 | 1 | 0 | |
|
Thomason Tuolumne Rd. Prop (steve's Plac Tuolumne County |
57 | 2 | 0 | |
|
Belk Farms Riverside County |
56 | 2 | 0 | |
|
Rock Creek Lakes Resort Inyo County |
56 | 1 | 0 | |
|
Laird Family Estate Napa County |
55 | 2 | 1 | |
|
Moore Learning (formerly Sheldon Acres) Sacramento County |
55 | 2 | 0 | |
|
Rim Rock Water Company San Luis Obispo County |
55 | 2 | 0 | |
|
Wagon Wheel Plaza Los Angeles County |
55 | 1 | 0 | |
|
Walking M Ranches Santa Barbara County |
54 | 2 | 1 | |
|
McCall Park Riv.county Parks Riverside County |
53 | 1 | 0 | |
|
Wespak, Inc. Tulare County |
53 | 2 | 1 | |
|
Gibson's Roadhouse Cafe Amador County |
52 | 2 | 0 | |
|
Country Corner Market Fresno · Fresno County |
51 | 1 | 0 | |
|
Glacier Lodge Inyo County |
51 | 1 | 0 | |
|
Angelique Maelee Properties County |
50 | 8 | 1 | |
|
Big Bend Big Bend Rv Park · County |
50 | 4 | 2 | |
|
California Hot Springs Water Company Tulare County |
50 | 3 | 0 | |
|
Hadley Date Gardens Riverside County |
50 | 1 | 0 | |
|
Napa Valley Marina Napa County |
50 | 1 | 0 | |
|
One Stop WS Stanislaus County |
50 | 1 | 0 | |
|
Primm Valley Golf Club San Bernardino County |
50 | 4 | 2 | |
|
Silverfork Store Water System El Dorado County |
50 | 2 | 0 | |
|
Soda Canyon Store Napa County |
50 | 1 | 0 | |
|
Taboose Creek Campground Inyo County |
50 | 1 | 0 | |
|
Tecopa Hot Springs Park Inyo County |
50 | 1 | 0 | |
|
The Rainbow Junction Water System Santa Clara County |
50 | 2 | 0 | |
|
Top Industries WS Monterey County |
50 | 1 | 0 | |
|
Caltrans Mountain Pass Jpoe Cvef San Bernardino County |
49 | 3 | 2 | |
|
Coachella Valley Public Cemetery Riverside County |
49 | 1 | 0 | |
|
Goathouse Brewing Agua Placer County |
49 | 2 | 0 | |
|
Martins Beach Water System San Mateo County |
49 | 1 | 0 | |
|
Napa Valley Reserve Water System Napa County |
49 | 1 | 0 | |
|
Vie-Del Company Fresno County |
49 | 1 | 0 | |
|
Faith and Family Farms WS Monterey County |
48 | 2 | 1 | |
|
Heck Cellars Water System Kern County |
47 | 1 | 0 | |
|
Tahoe Valley Lodge El Dorado County |
46 | 1 | 0 | |
|
Bear Valley Water Company San Luis Obispo County |
45 | 2 | 1 |
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.