What EPA's radon map says about Gregg County

EPA's own radon map rates Gregg County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Gregg County sits at the 27th percentile nationally for radon potential — above 27 of every 100 rated counties.

How Gregg County compares

About 126,679 people live in Gregg County, Texas, spread over 273.38 square miles. Averaged across its land area, Gregg County runs about 463 people per square mile. Among counties sharing Gregg County's EPA zone, it outranks 82% of them by population. EPA's geology-based Region 6 groups Gregg County with 502 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

A Zone 3 county like Gregg County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. A Zone 3 label describes Gregg County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Gregg County tests above the action level

Mitigation cost doesn't depend on Gregg 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

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.