Is Shackelford County, TX a radon risk area?

EPA's own radon map rates Shackelford County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Shackelford County sits at the 2nd percentile nationally for radon potential — above 2 of every 100 rated counties.

How Shackelford County compares

About 3,169 people live in Shackelford County, Texas, spread over 914.286 square miles. Averaged across its land area, Shackelford County runs about 3 people per square mile. Rank 977 by population within its EPA zone puts Shackelford County at the 5th percentile among zone peers. EPA's geology-based Region 6 groups Shackelford County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

At Zone 3, Shackelford 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 rating means Shackelford 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.

If Shackelford County tests above the action level

Nothing about Shackelford 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

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

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