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

Jackson County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally, Jackson County ranks higher in radon potential than 77% of rated counties (the 77th percentile).

Where Jackson County sits nationally

Jackson County, Tennessee is home to about 12,376 people across 308.81 square miles. That works out to roughly 40 people per square mile. By population, Jackson County is the 713th largest of every county sharing its EPA zone — the 33rd percentile by population within that zone. Jackson County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Jackson County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. That doesn't mean every Jackson County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Next steps for a home in Jackson County

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

The methodology guide shows exactly which EPA and Census sources feed Jackson County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.