Is Walker County, TX a radon risk area?

EPA places Walker 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. Nationally, Walker County ranks higher in radon potential than 25% of rated counties (the 25th percentile).

Walker County by the numbers

About 83,722 people live in Walker County, Texas, spread over 784.228 square miles. That works out to roughly 107 people per square mile. Rank 244 by population within its EPA zone puts Walker County at the 76th percentile among zone peers. Geologically, Walker County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

What this actually means for a house in Walker County

Walker County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. A Zone 3 label describes Walker County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Testing and mitigation in Walker County

Nothing about Walker 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

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