Tapcensus

Nitrite violations in Montana

3 active public water systems in Montana had a Nitrite violation in the past three years. What Nitrite is and why it matters.

Health effects: Methemoglobinemia ('blue baby syndrome') in infants under 6 months: reduced oxygen delivery to tissues can be life-threatening. Pregnant women and people with glucose-6-phosphate dehydrogenase (G6PD) deficiency are also at elevated risk. Adults are generally less susceptible due to more effective methemoglobin reduction.

Systems with a Nitrite violation

Latest quarter first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
Rocky Boy's Rural Water
County 		2,000 2 0
Cskt Division of Fire Management
County 		190 7 1
Namchak Retreat Ranch (nrr) South WS
County 		70 1 0
About this data

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