Is Lyon County, KY a radon risk area?

EPA's own radon map rates Lyon County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Lyon County sits at the 39th percentile nationally for radon potential — above 39 of every 100 rated counties.

Where Lyon County sits nationally

About 9,078 people live in Lyon County, Kentucky, spread over 213.785 square miles. That works out to roughly 42 people per square mile. Rank 839 by population within its EPA zone puts Lyon County at the 19th percentile among zone peers. Lyon County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

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

Next steps for a home in Lyon County

Nothing about Lyon 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

Lyon County's test kit answers today; a Airthings radon monitor keeps answering for Lyon 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 Lyon County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.