What EPA's radon map says about Comanche County

EPA places Comanche 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 Comanche County lands in the 10th percentile for radon potential.

How Comanche County compares

About 14,359 people live in Comanche County, Texas, spread over 937.753 square miles. Population density there runs about 15 people per square mile. Among counties sharing Comanche County's EPA zone, it outranks 30% of them by population. Comanche County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

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. Even at Zone 3, Comanche County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Next steps for a home in Comanche County

Mitigation cost doesn't depend on Comanche County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Texas'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. Use code RADONZONE-10OFF at checkout for 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.