Is Geary County, KS a radon risk area?

EPA's own radon map rates Geary County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts Geary County in the 87th percentile nationally for radon potential — higher than 87% of the counties EPA has rated.

Geary County by the numbers

About 35,459 people live in Geary County, Kansas, spread over 384.652 square miles. Averaged across its land area, Geary County runs about 92 people per square mile. Rank 422 by population within its EPA zone puts Geary County at the 60th percentile among zone peers. EPA's geology-based Region 7 groups Geary County with 411 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Geary County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Geary County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Geary County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Geary County

Nothing about Geary 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

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