Deer Lodge County, MT radon potential

EPA places Deer Lodge 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. Rank it against the rest of the country and Deer Lodge County lands in the 75th percentile for radon potential.

How Deer Lodge County compares

Deer Lodge County, Montana is home to about 9,811 people across 736.683 square miles. That works out to roughly 13 people per square mile. Within its own EPA zone, Deer Lodge County is bigger by population than 28% of the counties that share it. Deer Lodge 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 Deer Lodge County

Where the national indoor average runs about 1.3 pCi/L, Deer Lodge County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Being in Zone 1 raises the odds Deer Lodge County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

Testing and mitigation in Deer Lodge County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Montana's state radon program

For Deer Lodge County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Deer Lodge County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Deer Lodge County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Deer Lodge County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.