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 |
|---|---|---|---|---|
|
Campo Elementary School San Diego County |
300 | 3 | 0 | |
|
Heringer Estates Winery West Sacramento · Yolo County |
300 | 2 | 0 | |
|
Nmip Fire & Water System, LLC Stanislaus County |
300 | 1 | 0 | |
|
Pioneer Bible Church El Dorado County |
300 | 2 | 0 | |
|
Yurok Terwer Water System County |
300 | 6 | 1 | |
|
Lake Madrone Water District Butte County |
297 | 1 | 0 | |
|
Fcwwd 42/alluvial & Fancher Fresno County |
291 | 1 | 0 | |
|
Auburn Valley Community Service Dis Placer County |
290 | 1 | 0 | |
|
Lake Isabella KOA Campground Kern County |
280 | 1 | 0 | |
|
DD Mobile Home Park County |
275 | 9 | 3 | |
|
Alpine Meats INC San Joaquin County |
270 | 2 | 1 | |
|
Oakvale Park San Diego County |
260 | 3 | 0 | |
|
Nps Kelso Depot San Bernardino County |
254 | 1 | 0 | |
|
Rancho Colina Mobile Home Park San Luis Obispo County |
252 | 1 | 0 | |
|
Antelope Springs Placer County |
250 | 1 | 0 | |
|
Bass Lake Heights Mutual Water Madera County |
250 | 3 | 1 | |
|
DG Campo San Diego County |
250 | 1 | 0 | |
|
Dollar General Store # 14280 San Bernardino County |
250 | 1 | 0 | |
|
East Acres Mutual Water Company Madera County |
250 | 4 | 1 | |
|
Grant Line Kitchen Llc. Sacramento County |
250 | 1 | 0 | |
|
Holcomb Valley Ranch San Bernardino County |
250 | 2 | 0 | |
|
Lake Jodie Water System San Bernardino County |
250 | 3 | 1 | |
|
Meyers Water Co. Napa County |
250 | 1 | 0 | |
|
Ramona Water Company Riverside County |
250 | 3 | 2 | |
|
V Lions Ops Water System Kern County |
250 | 1 | 0 | |
|
Wench Creek Campground El Dorado County |
250 | 1 | 0 | |
|
Manny Water System Tulare County |
248 | 2 | 1 | |
|
Snowflower Placer County |
245 | 1 | 0 | |
|
Tecopa Water Vending Machine Inyo County |
241 | 2 | 0 | |
|
Rainbird Valley Mwc Kern County |
238 | 2 | 0 | |
|
Sierra Pines Camp El Dorado County |
226 | 2 | 0 | |
|
Howonquet Community(smith River) Howonquet Community · County |
220 | 5 | 0 | |
|
Armenian Church Camp Fresno County |
218 | 2 | 0 | |
|
Merced River Resort Merced County |
218 | 1 | 0 | |
|
Panamint Springs Resort Inyo County |
216 | 1 | 0 | |
|
Yurok Requa County |
215 | 7 | 2 | |
|
Hari's Market Tulare County |
212 | 1 | 0 | |
|
Cold Springs Main Cold Springs Rancheria · County |
209 | 7 | 2 | |
|
Optimists Volunteers for Youth San Mateo County |
205 | 1 | 0 | |
|
Orange Grove RV Park Kern County |
205 | 1 | 0 | |
|
School House Restaurant and Tavern Fresno County |
203 | 1 | 0 | |
|
Death Valley Junction Inyo County |
201 | 1 | 0 | |
|
Bear River Camp--South Shore Amador County |
200 | 2 | 0 | |
|
Calvin Crest Conference Center Madera County |
200 | 2 | 0 | |
|
Community of the Great Commission Placer County |
200 | 2 | 0 | |
|
Forest Lawn Scout Reservation San Bernardino County |
200 | 2 | 0 | |
|
Griffin Food and Gas Tulare County |
200 | 1 | 0 | |
|
Holland Park West Fresno County |
200 | 2 | 0 | |
|
Mariposa District Fairground Mariposa County |
200 | 2 | 0 | |
|
Pomo Campground Mendocino County |
200 | 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.