Tapcensus

Cyanide violations in Arizona

6 active public water systems in Arizona had a Cyanide violation in the past three years, 1 of them in the latest quarter of EPA's data. What Cyanide is and why it matters.

Health effects: Acute high-dose cyanide exposure interferes with cellular oxygen use and can cause rapid deterioration of the central nervous system, including headache, dizziness, and in severe cases, loss of consciousness. Chronic exposure at lower levels is associated with thyroid dysfunction and nerve damage. Most drinking water violations pose chronic rather than acute risk.

Systems with a Cyanide violation

Latest quarter first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
Scua Bylas
Bylas · County 		3,160 12 3
GW Santa Cruz Water CO
Maricopa · Pinal County 		84,000 7 0
Bullhead City Mohave
Bullhead City · Mohave County 		36,330 13 1
Adoc Eyman Unit
Florence · Pinal County 		3,969 8 2
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 Cyanide, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Cyanide 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.