Is Decatur County, TN a radon risk area?

Decatur 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 that's the 41st percentile for radon potential — Decatur County outranks 41% of every county EPA has rated.

Decatur County by the numbers

About 11,800 people live in Decatur County, Tennessee, spread over 333.879 square miles. Population density there runs about 35 people per square mile. Rank 788 by population within its EPA zone puts Decatur County at the 24th percentile among zone peers. Geologically, Decatur County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

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, Decatur County's Zone 2 prediction lands in the gap between the two. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Decatur County — testing is the only way to know an individual home's actual level.

If Decatur County tests above the action level

Nothing about Decatur 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

Decatur County's test kit answers today; a Airthings radon monitor keeps answering for Decatur 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 Decatur County's numbers. Whatever zone Decatur County carries, the zone explainer covers what it does and doesn't tell you about any one house.