What EPA's radon map says about Knott County

Knott County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. That puts Knott County in the 42nd percentile nationally for radon potential — higher than 42% of the counties EPA has rated.

How Knott County compares

About 13,438 people live in Knott County, Kentucky, spread over 351.524 square miles. Averaged across its land area, Knott County runs about 38 people per square mile. Among counties sharing Knott County's EPA zone, it outranks 28% of them by population. EPA's geology-based Region 4 groups Knott County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Knott County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Knott County — testing is the only way to know an individual home's actual level.

Next steps for a home in Knott County

Mitigation cost doesn't depend on Knott 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

Knott County's test kit answers today; a Airthings radon monitor keeps answering for Knott 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 Knott County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.