What EPA's radon map says about Wayne County

EPA places Wayne County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Wayne County in the 13th percentile nationally for radon potential — higher than 13% of the counties EPA has rated.

Wayne County by the numbers

About 19,749 people live in Wayne County, Mississippi, spread over 810.716 square miles. That works out to roughly 24 people per square mile. Among counties sharing Wayne County's EPA zone, it outranks 39% of them by population. Wayne 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 Wayne County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Wayne County's Zone 3 prediction is the low end of the scale. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Wayne County testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Wayne County

Mitigation cost doesn't depend on Wayne 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 Mississippi's state radon program

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

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.