What EPA's radon map says about Monroe County

Monroe County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally that's the 76th percentile for radon potential — Monroe County outranks 76% of every county EPA has rated.

Monroe County by the numbers

About 11,163 people live in Monroe County, Kentucky, spread over 329.475 square miles. Averaged across its land area, Monroe County runs about 34 people per square mile. Among counties sharing Monroe County's EPA zone, it outranks 31% of them by population. EPA's geology-based Region 4 groups Monroe County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Monroe County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Monroe County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. Some Monroe 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 Monroe County

Mitigation cost doesn't depend on Monroe 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

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

Monroe County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Monroe County carries, the zone explainer covers what it does and doesn't tell you about any one house.