Is Meagher County, MT a radon risk area?

EPA places Meagher County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Meagher County ranks higher in radon potential than 67% of rated counties (the 67th percentile).

How Meagher County compares

About 2,065 people live in Meagher County, Montana, spread over 2,391.868 square miles. Population density there runs about 1 people per square mile. Rank 1030 by population within its EPA zone puts Meagher County at the 3rd percentile among zone peers. Meagher County falls in EPA Radon Region 8, one of 291 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Meagher County

Meagher County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. That doesn't mean every Meagher County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Next steps for a home in Meagher County

Nothing about Meagher County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Montana's state radon program

Meagher County's test kit answers today; a Airthings radon monitor keeps answering for Meagher County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

Meagher County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.