What EPA's radon map says about Wayne County

EPA's own radon map rates Wayne County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 40th percentile for radon potential — Wayne County outranks 40% of every county EPA has rated.

Wayne County by the numbers

About 10,820 people live in Wayne County, Missouri, spread over 759.187 square miles. Averaged across its land area, Wayne County runs about 14 people per square mile. Among counties sharing Wayne County's EPA zone, it outranks 22% of them by population. Wayne County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Wayne County's Zone 2 prediction. Nothing about a Zone 2 label lowers the case for testing in Wayne County — EPA recommends it in every zone, moderate included.

Next steps for a home 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 Missouri'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

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