Combined Uranium violations in Arizona
18 active public water systems in Arizona had a Combined Uranium violation in the past three years, 6 of them in the latest quarter of EPA's data. What Combined Uranium is and why it matters.
Systems with a Combined Uranium violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Scua Bylas Bylas · County |
3,160 | 12 | 3 | |
|
CS Tierra Mesa Estates Water Company Yuma · Yuma County |
632 | 3 | 0 | |
|
Sun Leisure Estates Improvement District Yuma · Yuma County |
143 | 4 | 0 | |
|
Ranch Water Service INC Kingman · Mohave County |
135 | 7 | 1 | |
|
CS Rancheros Bonitos Water Company Yuma · Yuma County |
120 | 5 | 0 | |
|
CS Carter Water Company Carter · Pinal County |
28 | 5 | 2 | |
|
Tucson City of Tucson · Pima County |
732,906 | 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 | |
|
Lago del Oro Water Company Catalina · Pinal County |
18,132 | 2 | 0 | |
|
City of Show Low Show Low · Navajo County |
17,139 | 2 | 0 | |
|
Epcor North East Agua Fria Phoenix · Maricopa County |
14,723 | 2 | 0 | |
|
Scua Upper Seven Mile County |
8,478 | 12 | 3 | |
|
Arizona Village County |
3,211 | 10 | 2 | |
|
Sanders School District Sanders · Apache County |
350 | 6 | 2 | |
|
Sonoita Valley (south) Water Company Sonoita · Santa Cruz County |
172 | 4 | 2 | |
|
Antelope Peak Dwid Stanfield · Pinal County |
150 | 6 | 2 | |
|
Kelvin Simmons Coop Riverside · Pinal County |
28 | 6 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Combined Uranium, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Combined Uranium 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.