What EPA's radon map says about Blaine County

EPA's own radon map rates Blaine County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Blaine County in the 0th percentile nationally for radon potential — higher than 0% of the counties EPA has rated.

Blaine County by the numbers

About 454 people live in Blaine County, Nebraska, spread over 710.702 square miles. That works out to roughly 1 people per square mile. Among counties sharing Blaine County's EPA zone, it outranks 1% of them by population. EPA's geology-based Region 7 groups Blaine County with 411 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

At Zone 3, Blaine County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Even at Zone 3, Blaine County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

If Blaine County tests above the action level

Mitigation cost doesn't depend on Blaine 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

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

The methodology guide shows exactly which EPA and Census sources feed Blaine County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.