Is Wayne County, TN a radon risk area?

Wayne County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. That puts Wayne County in the 80th percentile nationally for radon potential — higher than 80% of the counties EPA has rated.

How Wayne County compares

About 15,974 people live in Wayne County, Tennessee, spread over 734.109 square miles. Averaged across its land area, Wayne County runs about 22 people per square mile. Rank 642 by population within its EPA zone puts Wayne County at the 40th percentile among zone peers. Wayne 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

Wayne County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Wayne County specifically.

If Wayne County tests above the action level

Nothing about Wayne 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

Wayne County's test kit answers today; a Airthings radon monitor keeps answering for Wayne 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 Wayne County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.