What EPA's radon map says about Bryan County

EPA's own radon map rates Bryan County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rank it against the rest of the country and Bryan County lands in the 22nd percentile for radon potential.

Bryan County by the numbers

About 50,305 people live in Bryan County, Oklahoma, spread over 904.348 square miles. Averaged across its land area, Bryan County runs about 56 people per square mile. Among counties sharing Bryan County's EPA zone, it outranks 67% of them by population. EPA's geology-based Region 6 groups Bryan County with 502 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

A Zone 3 county like Bryan County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. A Zone 3 label describes Bryan County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Bryan County tests above the action level

Mitigation cost doesn't depend on Bryan 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

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

More on how this number was built

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