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

EPA's own radon map rates Grant County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 0th percentile for radon potential — Grant County outranks 0% of every county EPA has rated.

Where Grant County sits nationally

Grant County, Nebraska is home to about 573 people across 776.696 square miles. Averaged across its land area, Grant County runs about 1 people per square mile. By population, Grant County is the 1022nd largest of every county sharing its EPA zone — the 1st percentile by population within that zone. EPA's geology-based Region 7 groups Grant County with 411 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Grant County's Zone 3 prediction is the low end of the scale. A Zone 3 label describes Grant County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Testing and mitigation in Grant County

For a Grant 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 Grant County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Grant 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 Grant County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Grant County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.