Is Lewis County, KY a radon risk area?

EPA's own radon map rates Lewis County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Lewis County sits at the 42nd percentile nationally for radon potential — above 42 of every 100 rated counties.

Where Lewis County sits nationally

About 12,875 people live in Lewis County, Kentucky, spread over 482.858 square miles. Averaged across its land area, Lewis County runs about 27 people per square mile. Rank 761 by population within its EPA zone puts Lewis County at the 26th percentile among zone peers. EPA's geology-based Region 4 groups Lewis County with 735 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Lewis County's Zone 2 prediction lands in the gap between the two. Middle-of-the-pack doesn't mean risk-free for any one Lewis County address — a moderate county average still leaves individual homes to test either side of it.

Next steps for a home in Lewis County

Nothing about Lewis 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

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

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