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

EPA's own radon map rates Osage County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Osage County sits at the 21st percentile nationally for radon potential — above 21 of every 100 rated counties.

How Osage County compares

Osage County, Oklahoma is home to about 46,495 people across 2,246.685 square miles. Averaged across its land area, Osage County runs about 21 people per square mile. By population, Osage County is the 363rd largest of every county sharing its EPA zone — the 65th percentile by population within that zone. Osage County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

A Zone 3 county like Osage 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 Osage County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Next steps for a home in Osage County

For a Osage 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 Osage County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Osage County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Osage County's figures come from

Osage County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Osage County carries, the zone explainer covers what it does and doesn't tell you about any one house.