Is Rooks County, KS a radon risk area?

EPA's own radon map rates Rooks County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts Rooks County in the 70th percentile nationally for radon potential — higher than 70% of the counties EPA has rated.

Where Rooks County sits nationally

About 4,748 people live in Rooks County, Kansas, spread over 890.527 square miles. That works out to roughly 5 people per square mile. Rank 930 by population within its EPA zone puts Rooks County at the 13th percentile among zone peers. Geologically, Rooks County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

What this actually means for a house in Rooks County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Rooks County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. 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 Rooks County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Rooks County

Nothing about Rooks 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

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

The methodology guide shows exactly which EPA and Census sources feed Rooks County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.