Is Barton County, MO a radon risk area?

Barton 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. Nationally that's the 41st percentile for radon potential — Barton County outranks 41% of every county EPA has rated.

How Barton County compares

About 11,717 people live in Barton County, Missouri, spread over 592.03 square miles. Averaged across its land area, Barton County runs about 20 people per square mile. Rank 789 by population within its EPA zone puts Barton County at the 24th percentile among zone peers. Barton 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 Barton County

EPA's Zone 2 rating for Barton County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Barton County — testing is the only way to know an individual home's actual level.

Next steps for a home in Barton County

Nothing about Barton 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

Barton County's test kit answers today; a Airthings radon monitor keeps answering for Barton 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 Barton County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.