Roger Mills County, OK: EPA's radon zone, explained

EPA places Roger Mills 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. That puts Roger Mills County in the 2nd percentile nationally for radon potential — higher than 2% of the counties EPA has rated.

Where Roger Mills County sits nationally

Roger Mills County, Oklahoma is home to about 3,304 people across 1,141.135 square miles. Population density there runs about 3 people per square mile. By population, Roger Mills County is the 971st largest of every county sharing its EPA zone — the 6th percentile by population within that zone. EPA's geology-based Region 6 groups Roger Mills County with 502 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Roger Mills County

At Zone 3, Roger Mills County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Don't read Zone 3 as a pass for Roger Mills County — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Roger Mills County

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

Where Roger Mills County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Roger Mills County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.