Roane County, TN radon potential

EPA's own radon map rates Roane County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts Roane County in the 91st percentile nationally for radon potential — higher than 91% of the counties EPA has rated.

Where Roane County sits nationally

Roane County, Tennessee is home to about 56,742 people across 360.768 square miles. Averaged across its land area, Roane County runs about 157 people per square mile. Within its own EPA zone, Roane County is bigger by population than 73% of the counties that share it. EPA's geology-based Region 4 groups Roane County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Roane County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Roane County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. Some Roane County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Next steps for a home in Roane County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Tennessee's state radon program

For Roane County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Roane 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 Roane County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Roane County carries, the zone explainer covers what it does and doesn't tell you about any one house.