Is Barry County, MO a radon risk area?

EPA's own radon map rates Barry County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Barry County sits at the 52nd percentile nationally for radon potential — above 52 of every 100 rated counties.

Barry County by the numbers

About 35,618 people live in Barry County, Missouri, spread over 778.123 square miles. Population density there runs about 46 people per square mile. Rank 437 by population within its EPA zone puts Barry County at the 58th percentile among zone peers. Barry County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Barry County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Barry County's Zone 2 prediction lands in the gap between the two. Nothing about a Zone 2 label lowers the case for testing in Barry County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Barry County

Nothing about Barry County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Missouri's state radon program

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

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