Nitrate violations in California
524 active public water systems in California had a Nitrate violation in the past three years, 41 of them still unresolved. What Nitrate is and why it matters.
Systems with a Nitrate violation
Unresolved first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Goosecross Cellars Napa County |
25 | 1 | 0 | |
|
Halfway Station San Luis Obispo County |
25 | 1 | 0 | |
|
Henry Miller Library Monterey County |
25 | 1 | 0 | |
|
Hillenbrand Farmhaus Brewery Newcastle · Placer County |
25 | 2 | 0 | |
|
Liana Estate Napa County |
25 | 1 | 0 | |
|
Loading Chute San Luis Obispo County |
25 | 1 | 0 | |
|
Murrieta/hernandez Farms Fresno County |
25 | 4 | 1 | |
|
Oasis Market Stanislaus County |
25 | 1 | 0 | |
|
OK Corral Amador County |
25 | 2 | 0 | |
|
Paul J. Wines Amador County |
25 | 2 | 0 | |
|
Pine Ridge Treatment Center San Bernardino County |
25 | 2 | 0 | |
|
Precision Mutual Water Company San Luis Obispo County |
25 | 1 | 0 | |
|
San Paso Truck Stop San Luis Obispo County |
25 | 1 | 0 | |
|
Santa Ynez Roblar Mobile Home Park Santa Barbara County |
25 | 4 | 0 | |
|
Silenus Vintners Napa County |
25 | 1 | 0 | |
|
Silverwood Japanese Restaurant Sushi & G San Bernardino County |
25 | 1 | 0 | |
|
South Fork Campground San Bernardino County |
25 | 1 | 0 | |
|
Sunset West Mutual Water Company Amador County |
25 | 2 | 1 | |
|
Treebones Resort WS Monterey County |
25 | 1 | 0 | |
|
Triangle Truck Stop (water) Stanislaus County |
25 | 1 | 0 | |
|
Usfs Hell Hole Placer County |
25 | 1 | 0 | |
|
Boulevard Pines Mobile Home and RV Park San Diego County |
21 | 1 | 0 | |
|
Robinson's Corner MHP Butte County |
20 | 8 | 2 | |
|
Bolo Station RV Park & Snack Bar San Bernardino County |
6 | 2 | 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. Retrieved from ECHO on Oct 11, 2026.