What EPA's radon map says about Thomas County

EPA's own radon map rates Thomas County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally, Thomas County ranks higher in radon potential than 21% of rated counties (the 21st percentile).

Thomas County by the numbers

About 46,054 people live in Thomas County, Georgia, spread over 544.637 square miles. Population density there runs about 85 people per square mile. Among counties sharing Thomas County's EPA zone, it outranks 65% of them by population. Thomas County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Thomas County

At Zone 3, Thomas County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Don't read Zone 3 as a pass for Thomas County — EPA's guidance to test every home makes no exception for counties predicted low.

If Thomas County tests above the action level

Mitigation cost doesn't depend on Thomas County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Georgia's state radon program

Thomas County's test kit answers today; a Airthings radon monitor keeps answering for Thomas County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Thomas County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.