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 |
|---|---|---|---|---|
|
Liberty Baptist Church Stanislaus County |
45 | 1 | 0 | |
|
Tank Farm Business Park San Luis Obispo County |
45 | 2 | 1 | |
|
Wilbur-Ellis Company LLC Yolo County |
45 | 1 | 0 | |
|
Viking RV Park Fresno County |
44 | 2 | 0 | |
|
Darr Water CO San Bernardino County |
43 | 4 | 1 | |
|
Lakeview Apartments Santa Cruz County |
43 | 3 | 1 | |
|
Mesa Grande (tract 2) County |
43 | 1 | 0 | |
|
L'azienda D'agostini Amador County |
42 | 2 | 0 | |
|
Gonzalez MHP County |
41 | 3 | 0 | |
|
Almira Water Association San Luis Obispo County |
40 | 2 | 0 | |
|
Chiri Sweet Water Company Santa Clara County |
40 | 1 | 0 | |
|
Coarsegold Self Serve Madera County |
40 | 1 | 0 | |
|
Countryside Drive-In Sacramento County |
40 | 1 | 0 | |
|
Cove Island Resort Fresno County |
40 | 1 | 0 | |
|
Dark Canyon Campground Usfs Riverside County |
40 | 1 | 0 | |
|
Elks Lodge #322 San Luis Obispo County |
40 | 3 | 1 | |
|
Pg&e Oakhurst Service Center Madera County |
40 | 1 | 0 | |
|
Pine Hill Egg Ranch San Diego County |
40 | 3 | 1 | |
|
Silverado Water System Sacramento County |
40 | 1 | 0 | |
|
ST Francis Motel San Joaquin County |
40 | 2 | 0 | |
|
Storer Transportation Stanislaus County |
40 | 1 | 0 | |
|
Four Bar C Farms Fresno County |
39 | 2 | 0 | |
|
Yosemite Riverside Inn Tuolumne County |
39 | 2 | 0 | |
|
Lhoist North America WS Monterey County |
38 | 1 | 0 | |
|
Sandoval MHP County |
38 | 5 | 1 | |
|
Bouchaine Vineyards Napa County |
37 | 1 | 0 | |
|
DI Rosa Art Preserve Napa County |
37 | 1 | 0 | |
|
Hounds Tooth Inn Madera County |
36 | 1 | 0 | |
|
Silver Spur Center/gallery Row Madera County |
36 | 1 | 0 | |
|
Cantina Water System Madera County |
35 | 1 | 0 | |
|
Cold Springs Subdivision Cold Springs Rancheria · County |
35 | 8 | 3 | |
|
Guadalupe Cooling Company San Luis Obispo County |
35 | 1 | 0 | |
|
Indian Village County |
35 | 7 | 2 | |
|
Natomas Golf Center Sacramento County |
35 | 1 | 0 | |
|
Pit River Chimney Rock County |
35 | 4 | 0 | |
|
R.s. Mutual Water Company Kern County |
35 | 3 | 0 | |
|
Snow Valley Mountain Resort San Bernardino County |
35 | 2 | 0 | |
|
Sws Land Development INC Madera County |
35 | 4 | 0 | |
|
Tahoe Vistana Placer County |
35 | 1 | 0 | |
|
Vargas MHP County |
35 | 1 | 0 | |
|
Waste Connections Water CO San Luis Obispo County |
35 | 1 | 0 | |
|
Wiebe Farms Tulare County |
35 | 2 | 0 | |
|
Fernwood WS Monterey County |
33 | 1 | 0 | |
|
Aptos Hills Mutual Water CO Santa Cruz County |
32 | 1 | 0 | |
|
Foothill Mutual Water Company Santa Clara County |
32 | 3 | 2 | |
|
South Kern Mutual Water Company Kern County |
32 | 4 | 1 | |
|
Aaa Kindness Care Home Santa Barbara County |
30 | 1 | 0 | |
|
Caltrans, Tecate Cvef San Diego County |
30 | 1 | 0 | |
|
Cerro Alto Campground San Luis Obispo County |
30 | 1 | 0 | |
|
Coarsegold Inn Madera County |
30 | 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.