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

EPA places Logan County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Logan County lands in the 23rd percentile for radon potential.

Logan County by the numbers

Logan County, Oklahoma is home to about 53,860 people across 743.747 square miles. That works out to roughly 72 people per square mile. By population, Logan County is the 324th largest of every county sharing its EPA zone — the 69th percentile by population within that zone. Geologically, Logan County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

What this actually means for a house in Logan County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Logan County's Zone 3 prediction is the low end of the scale. A Zone 3 rating means Logan County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Next steps for a home in Logan County

For a Logan 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 Logan County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Logan 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 Logan County's figures come from

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