What EPA's radon map says about Clayton County

EPA places Clayton County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Clayton County sits at the 63rd percentile nationally for radon potential — above 63 of every 100 rated counties.

Clayton County by the numbers

About 297,703 people live in Clayton County, Georgia, spread over 141.703 square miles. That works out to roughly 2,101 people per square mile. Among counties sharing Clayton County's EPA zone, it outranks 93% of them by population. Geologically, Clayton 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 Clayton County

EPA's Zone 2 rating for Clayton County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Nothing about a Zone 2 label lowers the case for testing in Clayton County — EPA recommends it in every zone, moderate included.

Next steps for a home in Clayton County

Mitigation cost doesn't depend on Clayton 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

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

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