What EPA's radon map says about Winkler County

EPA places Winkler 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, Winkler County ranks higher in radon potential than 4% of rated counties (the 4th percentile).

How Winkler County compares

About 7,381 people live in Winkler County, Texas, spread over 841.269 square miles. That works out to roughly 9 people per square mile. Among counties sharing Winkler County's EPA zone, it outranks 13% of them by population. Winkler County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Winkler County

Winkler County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Winkler County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Winkler County

Mitigation cost doesn't depend on Winkler 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

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