Is Republic County, KS a radon risk area?

Republic County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. That puts Republic County in the 70th percentile nationally for radon potential — higher than 70% of the counties EPA has rated.

How Republic County compares

About 4,613 people live in Republic County, Kansas, spread over 717.377 square miles. Population density there runs about 6 people per square mile. Rank 933 by population within its EPA zone puts Republic County at the 12th percentile among zone peers. Geologically, Republic County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Republic 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 Republic County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Republic County

Nothing about Republic 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

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

The methodology guide shows exactly which EPA and Census sources feed Republic County's numbers. Whatever zone Republic County carries, the zone explainer covers what it does and doesn't tell you about any one house.