Is Cleveland County, OK a radon risk area?

EPA's own radon map rates Cleveland County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Cleveland County sits at the 30th percentile nationally for radon potential — above 30 of every 100 rated counties.

Where Cleveland County sits nationally

About 303,952 people live in Cleveland County, Oklahoma, spread over 538.909 square miles. Population density there runs about 564 people per square mile. Rank 86 by population within its EPA zone puts Cleveland County at the 92nd percentile among zone peers. Geologically, Cleveland County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Cleveland County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. A Zone 3 label describes Cleveland County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Cleveland County tests above the action level

Nothing about Cleveland 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 Oklahoma's state radon program

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