Montgomery County, KS: EPA's radon zone, explained

Montgomery 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. Nationally that's the 51st percentile for radon potential — Montgomery County outranks 51% of every county EPA has rated.

Montgomery County by the numbers

Montgomery County, Kansas is home to about 30,459 people across 643.594 square miles. That works out to roughly 47 people per square mile. By population, Montgomery County is the 482nd largest of every county sharing its EPA zone — the 53rd percentile by population within that zone. Geologically, Montgomery 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

EPA's Zone 2 rating for Montgomery County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A county-wide moderate average, like Montgomery County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in Montgomery County

For a Montgomery County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Kansas's state radon program

For Montgomery County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Montgomery County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Montgomery County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Montgomery County carries, the zone explainer covers what it does and doesn't tell you about any one house.