Is Decatur County, KS a radon risk area?

EPA places Decatur County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Decatur County ranks higher in radon potential than 68% of rated counties (the 68th percentile).

How Decatur County compares

About 2,716 people live in Decatur County, Kansas, spread over 893.517 square miles. Averaged across its land area, Decatur County runs about 3 people per square mile. Rank 993 by population within its EPA zone puts Decatur County at the 7th percentile among zone peers. Decatur 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 Decatur County

Where the national indoor average runs about 1.3 pCi/L, Decatur County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Being in Zone 1 raises the odds Decatur County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

Next steps for a home in Decatur County

Nothing about Decatur 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 Kansas's state radon program

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