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 |
|---|---|---|---|---|
|
Cal-Am Water Coronado San Diego County |
106,000 | 1 | 0 | |
|
City of Milpitas Milpitas · Santa Clara County |
81,915 | 1 | 0 | |
|
Snow Summit San Bernardino County |
75,500 | 3 | 1 | |
|
Coachella Water Authority Coachella · Riverside County |
43,590 | 2 | 0 | |
|
Carmichael Water District Sacramento County |
41,193 | 2 | 0 | |
|
San Diego Mountain Lodge San Diego County |
26,641 | 3 | 0 | |
|
Port Hueneme City Water Dept Ventura County |
21,582 | 1 | 0 | |
|
Humboldt C.s.d. Humboldt County |
19,775 | 2 | 1 | |
|
City of Arroyo Grande Utilities Division San Luis Obispo County |
17,963 | 1 | 0 | |
|
Fillmore Water Dept Ventura County |
16,419 | 1 | 0 | |
|
Pala North County |
14,280 | 3 | 1 | |
|
Tract 180 Mutual Water Co. Los Angeles County |
14,000 | 1 | 0 | |
|
Tud Upper Basin Water System Tuolumne County |
13,331 | 1 | 0 | |
|
Muscoy Mwc No. 1 San Bernardino County |
13,000 | 1 | 0 | |
|
Tud Sonora/jamestown Water System Tuolumne County |
11,113 | 1 | 0 | |
|
City of Fowler Fowler · Fresno County |
7,448 | 1 | 0 | |
|
Heber Public Utility District Imperial County |
7,312 | 1 | 0 | |
|
Awa, Ione Jackson · Amador County |
7,227 | 1 | 0 | |
|
Tud Columbia Water System Tuolumne County |
5,482 | 1 | 0 | |
|
Awa, Tanner Amador County |
4,940 | 1 | 0 | |
|
Jacumba Valley Ranch Water Company San Diego County |
4,520 | 1 | 0 | |
|
Peppery Bar and Grill, the Tuolumne County |
4,500 | 1 | 0 | |
|
Slvwd Felton Water System Santa Cruz County |
4,491 | 2 | 1 | |
|
Mataguay Scout Reservation San Diego County |
4,000 | 1 | 0 | |
|
Willow County Water District Mendocino County |
3,797 | 1 | 0 | |
|
Blm-Briceburg Water System Mariposa County |
3,609 | 1 | 0 | |
|
Big River Development Big River · County |
3,550 | 9 | 4 | |
|
Borrego WD San Diego County |
3,429 | 1 | 0 | |
|
Arbuckle Public Utility District Colusa County |
3,251 | 2 | 1 | |
|
Smith Forks Water System Ventura County |
3,000 | 1 | 0 | |
|
Soboba County |
3,000 | 2 | 0 | |
|
Wild Water Adventures Fresno County |
3,000 | 1 | 0 | |
|
Terra Bella Irrigation District Tbt Tulare County |
2,656 | 1 | 0 | |
|
Caltrans Camp Roberts Rsra SB Monterey County |
2,560 | 1 | 0 | |
|
O'connor Hospital Santa Clara County |
2,500 | 2 | 1 | |
|
Twain Harte Community Services District Tuolumne County |
2,378 | 1 | 0 | |
|
Camp Wawona Mariposa County |
2,010 | 1 | 0 | |
|
Eastside Water Association Orange County |
2,000 | 1 | 0 | |
|
Mobiland Camper Park San Diego County |
2,000 | 1 | 0 | |
|
Cabazon Water District Riverside County |
1,900 | 2 | 0 | |
|
Sierra Tahoe Main Lodge El Dorado County |
1,900 | 5 | 0 | |
|
Sierra Tahoe West Bowl El Dorado County |
1,900 | 2 | 0 | |
|
Kinneloa Irrigation Dist. Los Angeles County |
1,808 | 1 | 0 | |
|
Chp Mission Grade Scales Pleasanton · Alameda County |
1,800 | 1 | 0 | |
|
Tud Tuolumne Water System Sonora · Tuolumne County |
1,798 | 1 | 0 | |
|
Tud Ponderosa Tuolumne County |
1,781 | 1 | 0 | |
|
Cold Springs Water CO Tuolumne County |
1,771 | 1 | 0 | |
|
Caltrans Camp Roberts Rsra NB Monterey County |
1,750 | 1 | 0 | |
|
Lake Don Pedro Csd Tuolumne County |
1,700 | 3 | 1 | |
|
Naval Base Ventura County, Point Mugu Ventura County |
1,700 | 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.