Is Hot Springs County, WY a radon risk area?

EPA places Hot Springs 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 that's the 70th percentile for radon potential — Hot Springs County outranks 70% of every county EPA has rated.

How Hot Springs County compares

About 4,625 people live in Hot Springs County, Wyoming, spread over 2,004.431 square miles. Averaged across its land area, Hot Springs County runs about 2 people per square mile. Rank 932 by population within its EPA zone puts Hot Springs County at the 13th percentile among zone peers. Hot Springs County falls in EPA Radon Region 8, one of 291 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Where the national indoor average runs about 1.3 pCi/L, Hot Springs County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Some Hot Springs County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Testing and mitigation in Hot Springs County

Nothing about Hot Springs 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 Wyoming's state radon program

Hot Springs County's test kit answers today; a Airthings radon monitor keeps answering for Hot Springs 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

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