What EPA's radon map says about Seminole County

EPA's own radon map rates Seminole County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 15th percentile for radon potential — Seminole County outranks 15% of every county EPA has rated.

Seminole County by the numbers

About 23,351 people live in Seminole County, Oklahoma, spread over 632.819 square miles. That works out to roughly 37 people per square mile. Among counties sharing Seminole County's EPA zone, it outranks 46% of them by population. EPA's geology-based Region 6 groups Seminole County with 502 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Seminole County's Zone 3 prediction is the low end of the scale. A Zone 3 label describes Seminole County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Testing and mitigation in Seminole County

Mitigation cost doesn't depend on Seminole County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Oklahoma's state radon program

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

More on how this number was built

Seminole County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.