What EPA's radon map says about Macon County

Macon County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Rank it against the rest of the country and Macon County lands in the 43rd percentile for radon potential.

How Macon County compares

About 15,177 people live in Macon County, Missouri, spread over 801.208 square miles. That works out to roughly 19 people per square mile. Among counties sharing Macon County's EPA zone, it outranks 31% of them by population. EPA's geology-based Region 7 groups Macon County with 411 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Macon County

Macon County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. Middle-of-the-pack doesn't mean risk-free for any one Macon County address — a moderate county average still leaves individual homes to test either side of it.

Next steps for a home in Macon County

Mitigation cost doesn't depend on Macon 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

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