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

Tulsa County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Rank it against the rest of the country and Tulsa County lands in the 32nd percentile for radon potential.

How Tulsa County compares

Tulsa County, Oklahoma is home to about 693,514 people across 570.242 square miles. Averaged across its land area, Tulsa County runs about 1,216 people per square mile. By population, Tulsa County is the 43rd largest of every county sharing its EPA zone — the 96th percentile by population within that zone. Tulsa 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 Tulsa County

Tulsa 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 Tulsa 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 Tulsa County

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

Where Tulsa County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Tulsa County's numbers. Whatever zone Tulsa County carries, the zone explainer covers what it does and doesn't tell you about any one house.