What EPA's radon map says about Hardeman County

EPA places Hardeman 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 Hardeman County in the 2nd percentile nationally for radon potential — higher than 2% of the counties EPA has rated.

Where Hardeman County sits nationally

About 3,417 people live in Hardeman County, Texas, spread over 695.114 square miles. That works out to roughly 5 people per square mile. Among counties sharing Hardeman County's EPA zone, it outranks 6% of them by population. EPA's geology-based Region 6 groups Hardeman County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

At Zone 3, Hardeman 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 Hardeman 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 Hardeman County

Mitigation cost doesn't depend on Hardeman 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

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.