What EPA's radon map says about Wilson County

EPA's own radon map rates Wilson County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally, Wilson County ranks higher in radon potential than 23% of rated counties (the 23rd percentile).

Where Wilson County sits nationally

About 55,415 people live in Wilson County, Texas, spread over 803.735 square miles. Population density there runs about 69 people per square mile. Among counties sharing Wilson County's EPA zone, it outranks 69% of them by population. Geologically, Wilson 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 Wilson County

Wilson 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. Don't read Zone 3 as a pass for Wilson County — EPA's guidance to test every home makes no exception for counties predicted low.

If Wilson County tests above the action level

Mitigation cost doesn't depend on Wilson 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

Wilson County's test kit answers today; a Airthings radon monitor keeps answering for Wilson County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

Wilson County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.