Tapcensus

Combined Uranium violations in Montana

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

Health effects: Uranium poses both radiological and chemical health risks. Chronic exposure is primarily associated with kidney damage due to its chemical toxicity as a heavy metal. The radiological risk — increased cancer probability — is also present but secondary to the nephrotoxic concern at drinking water concentrations. There is no safe threshold for radiation exposure.

Systems with a Combined Uranium violation

Latest quarter first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
Ashland Community Water System
County 		210 3 0
Whitehall Town of
Whitehall · Jefferson County 		1,500 3 0
Pryor Water System
County 		406 7 1
Heart Butte Water System
County 		400 5 0
Cskt Division of Fire Management
County 		190 7 1
Wettington Water District INC
Kalispell · Flathead County 		119 4 1
About this data

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