Is Reagan County, TX a radon risk area?

EPA's own radon map rates Reagan County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally, Reagan County ranks higher in radon potential than 2% of rated counties (the 2nd percentile).

Reagan County by the numbers

About 3,139 people live in Reagan County, Texas, spread over 1,175.314 square miles. Population density there runs about 3 people per square mile. Rank 978 by population within its EPA zone puts Reagan County at the 5th percentile among zone peers. EPA's geology-based Region 6 groups Reagan County with 502 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Reagan County

A Zone 3 county like Reagan County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Reagan County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Reagan County

Nothing about Reagan 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 Texas's state radon program

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

More on how this number was built

Reagan County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Reagan County carries, the zone explainer covers what it does and doesn't tell you about any one house.