What EPA's radon map says about Houston County

EPA places Houston 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. Houston County sits at the 15th percentile nationally for radon potential — above 15 of every 100 rated counties.

How Houston County compares

About 22,197 people live in Houston County, Texas, spread over 1,230.997 square miles. Population density there runs about 18 people per square mile. Among counties sharing Houston County's EPA zone, it outranks 44% of them by population. Geologically, Houston 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 Houston County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Houston County's Zone 3 prediction is the low end of the scale. Even at Zone 3, Houston County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Next steps for a home in Houston County

Mitigation cost doesn't depend on Houston 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

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

The methodology guide shows exactly which EPA and Census sources feed Houston County's numbers. Whatever zone Houston County carries, the zone explainer covers what it does and doesn't tell you about any one house.