Is Fayette County, TN a radon risk area?

Fayette County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Fayette County sits at the 21st percentile nationally for radon potential — above 21 of every 100 rated counties.

How Fayette County compares

About 44,476 people live in Fayette County, Tennessee, spread over 704.124 square miles. That works out to roughly 63 people per square mile. Rank 376 by population within its EPA zone puts Fayette County at the 64th percentile among zone peers. Fayette County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Fayette County's Zone 3 prediction is the low end of the scale. A Zone 3 label describes Fayette County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Fayette County tests above the action level

Nothing about Fayette 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 Tennessee's state radon program

Fayette County's test kit answers today; a Airthings radon monitor keeps answering for Fayette County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

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 Fayette County carries, the zone explainer covers what it does and doesn't tell you about any one house.