Is Trumbull County, OH a radon risk area?

EPA places Trumbull 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. Nationally that's the 62nd percentile for radon potential — Trumbull County outranks 62% of every county EPA has rated.

Trumbull County by the numbers

About 200,300 people live in Trumbull County, Ohio, spread over 617.592 square miles. Averaged across its land area, Trumbull County runs about 324 people per square mile. Rank 122 by population within its EPA zone puts Trumbull County at the 88th percentile among zone peers. Trumbull County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

EPA's Zone 2 rating for Trumbull 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 Trumbull County's, can still hide a specific house well above or below it — testing is what actually answers the question.

If Trumbull County tests above the action level

Nothing about Trumbull 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

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