What EPA's radon map says about Thurston County

EPA's own radon map rates Thurston County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Thurston County lands in the 73rd percentile for radon potential.

How Thurston County compares

About 6,637 people live in Thurston County, Nebraska, spread over 393.592 square miles. Averaged across its land area, Thurston County runs about 17 people per square mile. Among counties sharing Thurston County's EPA zone, it outranks 20% of them by population. Thurston County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Thurston County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Thurston County specifically.

Next steps for a home in Thurston County

Mitigation cost doesn't depend on Thurston 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

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Thurston County carries, the zone explainer covers what it does and doesn't tell you about any one house.