Is Glasscock County, TX a radon risk area?

EPA places Glasscock 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 Glasscock County in the 1st percentile nationally for radon potential — higher than 1% of the counties EPA has rated.

Glasscock County by the numbers

About 1,153 people live in Glasscock County, Texas, spread over 900.218 square miles. Averaged across its land area, Glasscock County runs about 1 people per square mile. Rank 1010 by population within its EPA zone puts Glasscock County at the 2nd percentile among zone peers. Geologically, Glasscock County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Zone vs. an actual test

Glasscock County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. A Zone 3 rating means Glasscock 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.

Testing and mitigation in Glasscock County

Nothing about Glasscock 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

Glasscock County's test kit answers today; a Airthings radon monitor keeps answering for Glasscock 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

The methodology guide shows exactly which EPA and Census sources feed Glasscock County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.