Revised Total Coliform Rule (RTCR) violations in California
770 active public water systems in California had a Revised Total Coliform Rule (RTCR) violation in the past three years, 100 of them in the latest quarter of EPA's data. What Revised Total Coliform Rule (RTCR) is and why it matters.
Systems with a Revised Total Coliform Rule (RTCR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Del Norte Mutual Water Co. Ventura County |
215 | 3 | 1 | |
|
Grizzly Lake Csd-Crocker/welch Plumas County |
215 | 2 | 0 | |
|
Yurok Requa County |
215 | 7 | 2 | |
|
Camp ST Nicholas Water System Kern County |
212 | 1 | 0 | |
|
Golden Sierra Estates_fka Mother Lode Tuolumne County |
210 | 2 | 1 | |
|
Cold Springs Main Cold Springs Rancheria · County |
209 | 7 | 2 | |
|
Atlas Business Park Tuolumne County |
206 | 1 | 0 | |
|
Scout Island Fresno · Fresno County |
205 | 1 | 0 | |
|
Gonzales Gas Station WS Monterey County |
204 | 1 | 0 | |
|
Date Gardens Mobile Home Park Imperial County |
202 | 2 | 1 | |
|
Twain Harte Valley Mwc Tuolumne County |
202 | 2 | 1 | |
|
California Odd Fellow-Rebekah Tuolumne County |
201 | 1 | 0 | |
|
Bucks Lakeshore Resort Plumas County |
200 | 1 | 0 | |
|
Calvin Crest Conference Center Madera County |
200 | 2 | 0 | |
|
Camp Osito Rancho San Bernardino County |
200 | 1 | 0 | |
|
Community of the Great Commission Placer County |
200 | 2 | 0 | |
|
Holland Park West Fresno County |
200 | 2 | 0 | |
|
Imerys Filtration Minerals, INC Santa Barbara County |
200 | 1 | 0 | |
|
Mariposa District Fairground Mariposa County |
200 | 2 | 0 | |
|
Mdf-Blue Lake CG Modoc County |
200 | 1 | 0 | |
|
Redwood Park C.s.d. Del Norte County |
200 | 2 | 1 | |
|
Sloughhouse Inn Sacramento County |
200 | 1 | 0 | |
|
Success Market Tulare County |
200 | 1 | 0 | |
|
The Barn Tulare County |
200 | 2 | 0 | |
|
Trees of Mystery Del Norte County |
200 | 1 | 0 | |
|
United Travel Plaza Yolo County |
200 | 1 | 0 | |
|
Usn San Clemente Island San Diego County |
200 | 3 | 0 | |
|
Woodcraft Rangers San Bernardino County |
200 | 1 | 0 | |
|
Alpine Acres Mutual Water CO Tuolumne County |
195 | 3 | 0 | |
|
Timber Cove County Water District Sonoma County |
190 | 2 | 0 | |
|
132 Investments Water System San Joaquin County |
187 | 1 | 0 | |
|
Ken's Shopping Center Fresno County |
187 | 1 | 0 | |
|
Fresno Clovis Rwrf Water System Fresno · Fresno County |
180 | 1 | 0 | |
|
River Ranch MHP San Bernardino County |
176 | 1 | 0 | |
|
Juniper Village Farm Labor Housing Dorris · Siskiyou County |
170 | 1 | 0 | |
|
Rancho del Rey Golf Club Merced County |
170 | 1 | 0 | |
|
Usfs Eureka Valley Campgd Tuolumne County |
168 | 1 | 0 | |
|
Nps-Wolverton Tulare County |
165 | 4 | 1 | |
|
San Joaquin Estates Mutual Water Company Kern County |
165 | 2 | 0 | |
|
Hartland Christian Camp Tulare County |
163 | 1 | 0 | |
|
Sugar Pine RV Resort Tuolumne County |
160 | 2 | 0 | |
|
Wilson Circle Mutual Water Company Inyo County |
158 | 1 | 0 | |
|
Gas Point Market Shasta County |
157 | 1 | 0 | |
|
Lower Line Creek Imprvmnt Assn Fresno County |
156 | 1 | 0 | |
|
Panaderia la Cabana Tulare County |
155 | 1 | 0 | |
|
Muller Mutual Water Company Tuolumne County |
154 | 1 | 0 | |
|
Golden Bear RV Park Del Norte County |
153 | 1 | 0 | |
|
Kashia County |
153 | 7 | 0 | |
|
Camp Alandale at Sky Meadows San Bernardino County |
152 | 1 | 0 | |
|
Lakehead Campground & RV Park Shasta County |
152 | 1 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Revised Total Coliform Rule (RTCR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Revised Total Coliform Rule (RTCR) 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.