Nemaha County, NE: EPA's radon zone, explained

EPA places Nemaha County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Nemaha County lands in the 73rd percentile for radon potential.

How Nemaha County compares

Nemaha County, Nebraska is home to about 7,046 people across 407.301 square miles. That works out to roughly 17 people per square mile. By population, Nemaha County is the 845th largest of every county sharing its EPA zone — the 21st percentile by population within that zone. EPA's geology-based Region 7 groups Nemaha County with 411 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Nemaha County

Where the national indoor average runs about 1.3 pCi/L, Nemaha County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. 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 Nemaha County will test well under the action level, and EPA's guidance is to test regardless of zone.

Next steps for a home in Nemaha County

For a Nemaha County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Nebraska's state radon program

For Nemaha County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Nemaha County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

Where Nemaha County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Nemaha County's numbers. Whatever zone Nemaha County carries, the zone explainer covers what it does and doesn't tell you about any one house.