Revised Total Coliform Rule (RTCR) violations in Arizona
493 active public water systems in Arizona had a Revised Total Coliform Rule (RTCR) violation in the past three years, 204 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 |
|---|---|---|---|---|
|
Yuma Regional Medical Center Yuma · Yuma County |
400 | 1 | 0 | |
|
Whetstone Ranch Water System Benson · Cochise County |
398 | 4 | 0 | |
|
Silverbell Irrigation & Drainage Dist Eloy · Pinal County |
375 | 6 | 0 | |
|
CS Mormon Lake Water Company Mormon Lake · Coconino County |
353 | 3 | 0 | |
|
CS Loma Linda Water Company Clifton · Greenlee County |
351 | 6 | 0 | |
|
New River Lds Church New River · Maricopa County |
350 | 2 | 0 | |
|
Shangri la Ranch New River · Maricopa County |
345 | 6 | 2 | |
|
AZ State Parks Catalina Mountain Catalina · Pima County |
330 | 1 | 0 | |
|
Lower Moencopi Consecutive System Lower Moencopi · County |
326 | 6 | 3 | |
|
Hidden Shores RV Village Imperial Dam · Yuma County |
324 | 3 | 0 | |
|
Dateland Public Service CO Dateland · Yuma County |
319 | 6 | 0 | |
|
San Simon Dwid San Simon · Cochise County |
312 | 6 | 2 | |
|
Shiloh Water Company Sahuarita · Pima County |
309 | 3 | 0 | |
|
Blue Sky RV Park Yuma · Yuma County |
300 | 2 | 0 | |
|
Kofa Co-Op Yuma · Yuma County |
300 | 2 | 0 | |
|
River Island Market Gas Parker · La Paz County |
300 | 1 | 0 | |
|
Southwest Water INC Topock · Mohave County |
300 | 1 | 0 | |
|
Tonalea (red Lake) Day School Bia Tonalea, Red Lake · County |
300 | 3 | 0 | |
|
Ventura Ranch Dwid Prescott Valley · Yavapai County |
300 | 6 | 2 | |
|
Santa Cruz County Fairgrounds Sonoita · Santa Cruz County |
297 | 3 | 1 | |
|
Salome Water Company Salome · La Paz County |
289 | 4 | 1 | |
|
Bouse Dwid Bouse · La Paz County |
284 | 7 | 1 | |
|
Usfs Conf Cave Springs Oak Creek Canyon · Coconino County |
280 | 3 | 1 | |
|
Verde Valley Manor Cottonwood · Yavapai County |
275 | 2 | 0 | |
|
Arizona Proving Ground Yucca · Mohave County |
271 | 1 | 0 | |
|
Rio Mercado Water Tucson · Pima County |
266 | 5 | 0 | |
|
Second Mesa Day School Bia County |
255 | 6 | 1 | |
|
Antelope Union High School Yuma · Yuma County |
250 | 8 | 0 | |
|
Leupp Contract Boarding School Bia Leupp · County |
250 | 3 | 0 | |
|
Meteor Crater RV Park Flagstaff · Coconino County |
250 | 2 | 0 | |
|
Mountain Dell Water INC Flagstaff · Coconino County |
250 | 4 | 0 | |
|
Mustang River Grill Parks · Coconino County |
250 | 1 | 0 | |
|
Sunset Mobile Home Park Sedona · Yavapai County |
250 | 2 | 0 | |
|
Yucca Water Association Yucca · Mohave County |
250 | 4 | 1 | |
|
CS Mohawk Utility Company Tacna · Yuma County |
243 | 8 | 0 | |
|
Oatman Water Company Oatman · Mohave County |
230 | 3 | 0 | |
|
Sunland Water Company Arizona City · Pinal County |
227 | 1 | 0 | |
|
Arizonian RV Resort Apache Junction · Pinal County |
225 | 6 | 1 | |
|
Ranchwood Community Tucson · Pima County |
225 | 2 | 0 | |
|
Wide Ruins Community Boarding School Bia Wide Ruins · County |
215 | 4 | 1 | |
|
CS Stoneman Lake Water Company Happy Jack · Coconino County |
212 | 3 | 0 | |
|
Santa Catalina Catholic Church Tucson · Pima County |
212 | 2 | 0 | |
|
CS West Village Water Company Flagstaff · Coconino County |
210 | 7 | 0 | |
|
Pcnr Colossal Cave Tucson · Pima County |
210 | 1 | 0 | |
|
Tonto Rim Christian Camp Kohls Ranch · Gila County |
208 | 4 | 0 | |
|
Carrizo Store County |
203 | 4 | 2 | |
|
National Memorial Cemetery Cave Creek · Maricopa County |
202 | 4 | 2 | |
|
Camp Lawton Mount Lemmon · Pima County |
200 | 2 | 0 | |
|
Concern INC Camp Shadow Heber · Navajo County |
200 | 1 | 0 | |
|
Indian Ruins Holbrook · Apache County |
200 | 4 | 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 Arizona 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.