Is Nemaha County, KS a radon risk area?

EPA's own radon map rates Nemaha County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally that's the 76th percentile for radon potential — Nemaha County outranks 76% of every county EPA has rated.

Nemaha County by the numbers

About 10,062 people live in Nemaha County, Kansas, spread over 717.427 square miles. Population density there runs about 14 people per square mile. Rank 759 by population within its EPA zone puts Nemaha County at the 29th percentile among zone peers. EPA's geology-based Region 7 groups Nemaha County with 411 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Nemaha County

Nemaha County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Nemaha County specifically.

If Nemaha County tests above the action level

Nothing about Nemaha 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

Nemaha County's test kit answers today; a Airthings radon monitor keeps answering for Nemaha County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

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. Whatever zone Nemaha County carries, the zone explainer covers what it does and doesn't tell you about any one house.