Tapcensus

Chlorite violations in Arizona

6 active public water systems in Arizona had a Chlorite violation in the past three years, 3 of them in the latest quarter of EPA's data. What Chlorite is and why it matters.

Health effects: Elevated chlorite in drinking water can cause hemolytic anemia by oxidizing red blood cell membranes. Infants, young children, pregnant women, and individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency are especially sensitive. Chronic low-level exposure may also affect the nervous system. Most violations reflect localized high levels at specific monitoring points.

Systems with a Chlorite violation

Latest quarter first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
Apache Junction Water District
Apache Junction · Pinal County 		15,610 6 0
Epcor Willow Valley/king Street
Mohave Valley · Mohave County 		3,566 2 0
Epcor Willow Valley/lake Cimarron
Mohave Valley · Mohave County 		596 1 0
City of Yuma
Yuma · Yuma County 		103,264 1 0
Flagstaff City of
Flagstaff · Coconino County 		79,796 5 0
City of Hope Phoenix
Goodyear · Maricopa County 		700 3 0
About this data

A system is counted once if any of its violations in the past three years involved Chlorite, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Chlorite 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.