What EPA's radon map says about Stevens County

Stevens 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. Rank it against the rest of the country and Stevens County lands in the 36th percentile for radon potential.

Where Stevens County sits nationally

About 5,035 people live in Stevens County, Kansas, spread over 727.428 square miles. That works out to roughly 7 people per square mile. Among counties sharing Stevens County's EPA zone, it outranks 9% of them by population. EPA's geology-based Region 7 groups Stevens County with 411 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Stevens County

Stevens County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Nothing about a Zone 2 label lowers the case for testing in Stevens County — EPA recommends it in every zone, moderate included.

Next steps for a home in Stevens County

Mitigation cost doesn't depend on Stevens County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Kansas's state radon program

Stevens County's test kit answers today; a Airthings radon monitor keeps answering for Stevens 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 Stevens County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.