Selenium violations in Arizona
6 active public water systems in Arizona had a Selenium violation in the past three years, 2 of them in the latest quarter of EPA's data. What Selenium is and why it matters.
Systems with a Selenium violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Scua Bylas Bylas · County |
3,160 | 12 | 3 | |
|
Pinedale Estates Dwid Show Low · Navajo County |
208 | 6 | 1 | |
|
GW Santa Cruz Water CO Maricopa · Pinal County |
84,000 | 7 | 0 | |
|
Bullhead City Mohave Bullhead City · Mohave County |
36,330 | 13 | 1 | |
|
Hopi High School Bia Hopi High School · County |
1,005 | 11 | 4 | |
|
Lower Moencopi Spring Source Lower Moencopi · County |
465 | 12 | 3 |
About this data
A system is counted once if any of its violations in the past three years involved Selenium, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Selenium 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. Retrieved from ECHO on Oct 11, 2026.