Tapcensus

Stage 1 Disinfectants and DBP Rule violations in Arizona

2 active public water systems in Arizona had a Stage 1 Disinfectants and DBP Rule violation in the past three years, 2 of them in the latest quarter of EPA's data. What Stage 1 Disinfectants and DBP Rule is and why it matters.

Health effects: See TTHMs (2950) and HAA5 (2456) for their specific health effects. Bromate is a probable human carcinogen (Group B2). Chlorite at elevated levels can cause hemolytic anemia, particularly in infants, developing fetuses, and individuals with certain enzyme deficiencies. Violations indicate the system exceeded one or more of these byproduct or disinfectant limits.

Systems with a Stage 1 Disinfectants and DBP Rule violation

Latest quarter first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
Ak-Chin Village
Ak-chin Village · County 		11,646 6 1
Hopi High School Bia
Hopi High School · County 		1,005 11 4
About this data

A system is counted once if any of its violations in the past three years involved Stage 1 Disinfectants and DBP Rule, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Stage 1 Disinfectants and DBP Rule 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.