Is Allegany County, MD a radon risk area?

EPA's own radon map rates Allegany County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally, Allegany County ranks higher in radon potential than 57% of rated counties (the 57th percentile).

Where Allegany County sits nationally

About 67,097 people live in Allegany County, Maryland, spread over 422.199 square miles. Population density there runs about 159 people per square mile. Rank 276 by population within its EPA zone puts Allegany County at the 73rd percentile among zone peers. Allegany County falls in EPA Radon Region 3, one of 245 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Allegany County

Allegany County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). A county-wide moderate average, like Allegany County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in Allegany County

Nothing about Allegany 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 Maryland's state radon program

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

More on how this number was built

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