Is Fentress County, TN a radon risk area?

Fentress County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Nationally, Fentress County ranks higher in radon potential than 46% of rated counties (the 46th percentile).

How Fentress County compares

About 20,129 people live in Fentress County, Tennessee, spread over 498.607 square miles. Population density there runs about 40 people per square mile. Rank 627 by population within its EPA zone puts Fentress County at the 39th percentile among zone peers. EPA's geology-based Region 4 groups Fentress County with 735 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

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

If Fentress County tests above the action level

Nothing about Fentress 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

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

Fentress County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.