Unicoi County, TN: EPA's radon zone, explained

Unicoi 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. That puts Unicoi County in the 45th percentile nationally for radon potential — higher than 45% of the counties EPA has rated.

How Unicoi County compares

Unicoi County, Tennessee is home to about 17,872 people across 186.064 square miles. Population density there runs about 96 people per square mile. By population, Unicoi County is the 664th largest of every county sharing its EPA zone — the 36th percentile by population within that zone. Geologically, Unicoi County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

What this actually means for a house in Unicoi County

Unicoi 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. Nothing about a Zone 2 label lowers the case for testing in Unicoi County — EPA recommends it in every zone, moderate included.

Next steps for a home in Unicoi County

For a Unicoi County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Tennessee's state radon program

For Unicoi County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Unicoi County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Unicoi County's figures come from

Unicoi County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Unicoi County carries, the zone explainer covers what it does and doesn't tell you about any one house.