Stage 2 Disinfectants and Disinfection Byproducts Rule violations in Arizona
14 active public water systems in Arizona had a Stage 2 Disinfectants and Disinfection Byproducts Rule violation in the past three years, 14 of them in the latest quarter of EPA's data. What Stage 2 Disinfectants and Disinfection Byproducts Rule is and why it matters.
Systems with a Stage 2 Disinfectants and Disinfection Byproducts Rule violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Leupp-Birdsprings-Tolani Lake Ntua Leupp, Birdsprings, Tolani Lake · County |
2,100 | 2 | 2 | |
|
Lukachukai Ntua Lukachukai · County |
1,659 | 2 | 1 | |
|
Inscription House-Navajo Mountain Ntua Inscription House, Broad Mesa West, Dry · County |
1,368 | 2 | 2 | |
|
Cottonwood-Tselani Ntua Cottonwood, Tselani · County |
1,334 | 2 | 1 | |
|
Tsaile-Dine College Ntua Tsaile, Dine College · County |
1,190 | 2 | 1 | |
|
Klagetoh Ntua Klagetoh, South Ganado, Wide Ruins · County |
971 | 2 | 2 | |
|
Shonto Ntua Shonto · County |
397 | 2 | 2 | |
|
Low Mountain Boarding School Bia Low Mountain · County |
339 | 3 | 2 | |
|
Long House Valley Ntua Long House Valley, West Of Kayenta · County |
277 | 2 | 2 | |
|
Rocky Ridge Boarding School Bia Dinnebito · County |
250 | 4 | 3 | |
|
Forest Lake Ntua Forest Lake · County |
233 | 2 | 2 | |
|
White Post Mission Ntua White Post Mission, Shonto · County |
185 | 1 | 1 | |
|
Cane Valley Ntua Cane Valley · County |
58 | 2 | 2 | |
|
Twin Arrows Ntua Twin Arrows · County |
25 | 3 | 2 |
About this data
A system is counted once if any of its violations in the past three years involved Stage 2 Disinfectants and Disinfection Byproducts Rule, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Stage 2 Disinfectants and Disinfection Byproducts 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.