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

Claiborne County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Rank it against the rest of the country and Claiborne County lands in the 86th percentile for radon potential.

How Claiborne County compares

Claiborne County, Tennessee is home to about 33,070 people across 434.643 square miles. Population density there runs about 76 people per square mile. By population, Claiborne County is the 441st largest of every county sharing its EPA zone — the 59th percentile by population within that zone. Claiborne County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Claiborne County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Claiborne County specifically.

Next steps for a home in Claiborne County

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

Where Claiborne County's figures come from

Claiborne County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.