What EPA's radon map says about Thayer County

Thayer County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Rank it against the rest of the country and Thayer County lands in the 70th percentile for radon potential.

Thayer County by the numbers

About 4,870 people live in Thayer County, Nebraska, spread over 573.789 square miles. That works out to roughly 8 people per square mile. Among counties sharing Thayer County's EPA zone, it outranks 13% of them by population. Geologically, Thayer County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Thayer County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. Some Thayer County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Next steps for a home in Thayer County

Mitigation cost doesn't depend on Thayer 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 Nebraska's state radon program

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