Is Mahoning County, OH a radon risk area?

EPA's own radon map rates Mahoning County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. That puts Mahoning County in the 62nd percentile nationally for radon potential — higher than 62% of the counties EPA has rated.

Where Mahoning County sits nationally

About 225,786 people live in Mahoning County, Ohio, spread over 411.521 square miles. Population density there runs about 549 people per square mile. Rank 109 by population within its EPA zone puts Mahoning County at the 90th percentile among zone peers. Geologically, Mahoning County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Mahoning County's Zone 2 prediction lands in the gap between the two. Middle-of-the-pack doesn't mean risk-free for any one Mahoning County address — a moderate county average still leaves individual homes to test either side of it.

Next steps for a home in Mahoning County

Nothing about Mahoning 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 Ohio's state radon program

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

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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.