Is Comanche County, OK a radon risk area?

EPA's own radon map rates Comanche County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 27th percentile for radon potential — Comanche County outranks 27% of every county EPA has rated.

Where Comanche County sits nationally

About 121,396 people live in Comanche County, Oklahoma, spread over 1,069.322 square miles. That works out to roughly 114 people per square mile. Rank 194 by population within its EPA zone puts Comanche County at the 81st percentile among zone peers. Comanche County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Comanche County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Comanche County testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Comanche County

Nothing about Comanche County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Oklahoma's state radon program

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

More on how this number was built

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