Is Campbell County, TN a radon risk area?

EPA's own radon map rates Campbell County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rank it against the rest of the country and Campbell County lands in the 20th percentile for radon potential.

Where Campbell County sits nationally

About 40,238 people live in Campbell County, Tennessee, spread over 480.19 square miles. That works out to roughly 84 people per square mile. Rank 402 by population within its EPA zone puts Campbell County at the 61st percentile among zone peers. Geologically, Campbell 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 Campbell County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Campbell County's Zone 3 prediction is the low end of the scale. Don't read Zone 3 as a pass for Campbell County — EPA's guidance to test every home makes no exception for counties predicted low.

If Campbell County tests above the action level

Nothing about Campbell 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

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

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