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 |
|---|---|---|---|---|
|
Usfs Knf Big Springs Jacob Lake · Coconino County |
25 | 4 | 2 | |
|
Usfs-Asnf-Winn Campground Greer · Apache County |
25 | 1 | 0 | |
|
Phoenix City of Phoenix · Maricopa County |
1,695,000 | 2 | 0 | |
|
Mesa City of Mesa · Maricopa County |
466,000 | 3 | 0 | |
|
GW Santa Cruz Water CO Maricopa · Pinal County |
84,000 | 7 | 0 | |
|
Bullhead City Mohave Bullhead City · Mohave County |
36,330 | 13 | 1 | |
|
Foothills Water and Sewer LLC Yuma · Yuma County |
32,425 | 5 | 0 | |
|
Pima Utilities Chandler · Maricopa County |
20,000 | 7 | 3 | |
|
Grand Canyon National Park Grand Canyon · Coconino County |
16,590 | 7 | 0 | |
|
Ak-Chin Village Ak-chin Village · County |
11,646 | 6 | 1 | |
|
Globe City of Globe · Gila County |
7,536 | 4 | 0 | |
|
Valley Pioneers Water Company INC Kingman · Mohave County |
6,263 | 4 | 0 | |
|
North Mohave Valley Bullhead City · Mohave County |
5,190 | 6 | 2 | |
|
Holbrook City of Holbrook · Navajo County |
4,833 | 6 | 2 | |
|
Epcor Lake Havasu Lake Havasu City · Mohave County |
4,712 | 5 | 0 | |
|
Aspc Yuma Yuma · Yuma County |
4,197 | 4 | 0 | |
|
Town of Taylor Taylor · Navajo County |
4,190 | 7 | 2 | |
|
Golden Shores Water Company Topock · Mohave County |
3,970 | 3 | 1 | |
|
Ganado-Burnside-Cornfield-Steamboat Ntua Ganado, Cornfield, Steamboat and 1 more · County |
3,947 | 2 | 1 | |
|
Colorado River Regional Water System County |
3,476 | 6 | 0 | |
|
Town of Parker County |
3,360 | 2 | 0 | |
|
Desert Foothills Bullhead City · Mohave County |
3,091 | 6 | 1 | |
|
Tucson Medical Center Tucson · Pima County |
3,000 | 4 | 1 | |
|
Hondah Casino County |
2,926 | 6 | 1 | |
|
Clearwater Utility Company INC Buckeye · Maricopa County |
2,747 | 5 | 1 | |
|
Blm Laposa Ltva Quartzsite · La Paz County |
2,500 | 1 | 0 | |
|
Bia San Carlos County |
2,150 | 8 | 1 | |
|
Tuba City Boarding School Bia Tuba City Bia Boarding School · County |
2,040 | 2 | 0 | |
|
Springerville Town of Springerville · Apache County |
1,972 | 5 | 1 | |
|
Gila Bend Town of Buckeye · Maricopa County |
1,922 | 7 | 0 | |
|
Jbs Tolleson Tolleson · Maricopa County |
1,700 | 2 | 0 | |
|
Vail School District Elementary School Vail · Pima County |
1,680 | 3 | 0 | |
|
Cedar Grove Water Company Vernon · Apache County |
1,564 | 2 | 0 | |
|
Federal Correction Institution Phoenix · Maricopa County |
1,500 | 5 | 0 | |
|
Joshua Valley Utility Company Meadview · Mohave County |
1,500 | 2 | 0 | |
|
Sunrise Vista Utilities Sunrise Vistas · Mohave County |
1,500 | 3 | 1 | |
|
Saguaro National Park Tucson · Pima County |
1,440 | 2 | 0 | |
|
Shungopavi Shungopavi · County |
1,430 | 7 | 3 | |
|
Mayer Dwid Mayer · Yavapai County |
1,400 | 7 | 1 | |
|
Kayenta Sandstone Housing Kayenta · County |
1,375 | 5 | 1 | |
|
Katherine Landing Dwtp Katherine Landing · Mohave County |
1,300 | 5 | 0 | |
|
Lord AZ Water 2 Winchester Trails Vernon · Apache County |
1,289 | 4 | 0 | |
|
Watco Water Bourden Ranch Estates · Navajo County |
1,039 | 4 | 1 | |
|
Sunrise Midway (mcnary/sunrise County |
1,007 | 1 | 0 | |
|
Hopi High School Bia Hopi High School · County |
1,005 | 11 | 4 | |
|
Adot Oak Creek Rim M/s Overlook Vista Oak Creek Canyon · Coconino County |
1,000 | 2 | 0 | |
|
Payson Water Mesa de Caballo Payson · Gila County |
976 | 2 | 0 | |
|
Gcnra Lees Ferry Lees Ferry · Coconino County |
890 | 5 | 1 | |
|
Tsehootsooi Middle School Fort Defiance · County |
875 | 5 | 1 | |
|
Adoc Aspc Fort Grant Bonita · Graham County |
800 | 7 | 1 |
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.