What EPA's radon map says about Perry County

EPA's own radon map rates Perry County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. That puts Perry County in the 49th percentile nationally for radon potential — higher than 49% of the counties EPA has rated.

Perry County by the numbers

About 26,739 people live in Perry County, Kentucky, spread over 339.724 square miles. That works out to roughly 79 people per square mile. Among counties sharing Perry County's EPA zone, it outranks 49% of them by population. Geologically, Perry County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

What this actually means for a house in Perry County

EPA's Zone 2 rating for Perry County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A county-wide moderate average, like Perry County's, can still hide a specific house well above or below it — testing is what actually answers the question.

If Perry County tests above the action level

Mitigation cost doesn't depend on Perry County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Kentucky's state radon program

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

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Perry County's numbers. Whatever zone Perry County carries, the zone explainer covers what it does and doesn't tell you about any one house.