Is Boyd County, KY a radon risk area?

Boyd 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. Rank it against the rest of the country and Boyd County lands in the 55th percentile for radon potential.

Where Boyd County sits nationally

About 47,777 people live in Boyd County, Kentucky, spread over 159.866 square miles. That works out to roughly 299 people per square mile. Rank 349 by population within its EPA zone puts Boyd County at the 66th percentile among zone peers. Geologically, Boyd County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

EPA's Zone 2 rating for Boyd 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 Boyd County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Testing and mitigation in Boyd County

Nothing about Boyd 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 Kentucky's state radon program

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.