Is Knox County, KY a radon risk area?

EPA's own radon map rates Knox County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Knox County lands in the 50th percentile for radon potential.

Where Knox County sits nationally

About 29,657 people live in Knox County, Kentucky, spread over 386.33 square miles. That works out to roughly 77 people per square mile. Rank 489 by population within its EPA zone puts Knox County at the 53rd percentile among zone peers. EPA's geology-based Region 4 groups Knox County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Knox 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. Knox County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Next steps for a home in Knox County

Nothing about Knox 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

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Knox County carries, the zone explainer covers what it does and doesn't tell you about any one house.