Is Sarpy County, NE a radon risk area?

EPA places Sarpy 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. Sarpy County sits at the 97th percentile nationally for radon potential — above 97 of every 100 rated counties.

How Sarpy County compares

About 204,828 people live in Sarpy County, Nebraska, spread over 238.005 square miles. Averaged across its land area, Sarpy County runs about 861 people per square mile. Rank 96 by population within its EPA zone puts Sarpy County at the 91st percentile among zone peers. Sarpy County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Sarpy 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. 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 Sarpy County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Sarpy County

Nothing about Sarpy County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Nebraska's state radon program

Sarpy County's test kit answers today; a Airthings radon monitor keeps answering for Sarpy County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

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