What EPA's radon map says about Furnas County

Furnas County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. That puts Furnas County in the 70th percentile nationally for radon potential — higher than 70% of the counties EPA has rated.

Where Furnas County sits nationally

About 4,468 people live in Furnas County, Nebraska, spread over 719.204 square miles. Population density there runs about 6 people per square mile. Among counties sharing Furnas County's EPA zone, it outranks 12% of them by population. EPA's geology-based Region 7 groups Furnas County with 411 other counties nationally sharing its underlying rock and soil profile.

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 Furnas County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Furnas County will test well under the action level, and EPA's guidance is to test regardless of zone.

If Furnas County tests above the action level

Mitigation cost doesn't depend on Furnas 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

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

Furnas 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.