Is Erie County, OH a radon risk area?

EPA places Erie County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Erie County in the 58th percentile nationally for radon potential — higher than 58% of the counties EPA has rated.

Erie County by the numbers

About 73,841 people live in Erie County, Ohio, spread over 251.288 square miles. Population density there runs about 294 people per square mile. Rank 250 by population within its EPA zone puts Erie County at the 76th percentile among zone peers. Geologically, Erie County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Zone vs. an actual test

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Erie County's Zone 2 prediction lands in the gap between the two. Nothing about a Zone 2 label lowers the case for testing in Erie County — EPA recommends it in every zone, moderate included.

Next steps for a home in Erie County

Nothing about Erie 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

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

The methodology guide shows exactly which EPA and Census sources feed Erie County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.