Is Chase County, KS a radon risk area?

Chase 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 34th percentile for radon potential — Chase County outranks 34% of every county EPA has rated.

Where Chase County sits nationally

About 2,507 people live in Chase County, Kansas, spread over 773.053 square miles. That works out to roughly 3 people per square mile. Rank 993 by population within its EPA zone puts Chase County at the 4th percentile among zone peers. EPA's geology-based Region 7 groups Chase County with 411 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Chase County

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 Chase County's Zone 2 prediction. A county-wide moderate average, like Chase County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Testing and mitigation in Chase County

Nothing about Chase 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

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