Is Throckmorton County, TX a radon risk area?

Throckmorton County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Rank it against the rest of the country and Throckmorton County lands in the 1st percentile for radon potential.

How Throckmorton County compares

About 1,532 people live in Throckmorton County, Texas, spread over 912.552 square miles. That works out to roughly 2 people per square mile. Rank 1000 by population within its EPA zone puts Throckmorton County at the 3rd percentile among zone peers. EPA's geology-based Region 6 groups Throckmorton County with 502 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

At Zone 3, Throckmorton 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. A Zone 3 label describes Throckmorton County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Next steps for a home in Throckmorton County

Nothing about Throckmorton 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

Throckmorton County's test kit answers today; a Airthings radon monitor keeps answering for Throckmorton 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 Throckmorton County's numbers. Whatever zone Throckmorton County carries, the zone explainer covers what it does and doesn't tell you about any one house.