Sequoyah County, OK: EPA's radon zone, explained

EPA's own radon map rates Sequoyah County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. That puts Sequoyah County in the 53rd percentile nationally for radon potential — higher than 53% of the counties EPA has rated.

Sequoyah County by the numbers

Sequoyah County, Oklahoma is home to about 40,555 people across 673.575 square miles. That works out to roughly 60 people per square mile. By population, Sequoyah County is the 396th largest of every county sharing its EPA zone — the 62nd percentile by population within that zone. Sequoyah County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Sequoyah County

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Sequoyah County's Zone 2 prediction. Nothing about a Zone 2 label lowers the case for testing in Sequoyah County — EPA recommends it in every zone, moderate included.

Next steps for a home in Sequoyah County

For a Sequoyah 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 Oklahoma's state radon program

For Sequoyah County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Sequoyah 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 Sequoyah 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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.