Radium-228 violations in Arizona
8 active public water systems in Arizona had a Radium-228 violation in the past three years, 1 of them in the latest quarter of EPA's data. What Radium-228 is and why it matters.
Systems with a Radium-228 violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Ponderosa Park Dwid Prescott · Yavapai County |
602 | 5 | 1 | |
|
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 | |
|
Springerville Town of Springerville · Apache County |
1,972 | 5 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Radium-228, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Radium-228 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.