Cass County, NE radon potential

EPA's own radon map rates Cass County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts Cass County in the 84th percentile nationally for radon potential — higher than 84% of the counties EPA has rated.

Where Cass County sits nationally

Cass County, Nebraska is home to about 27,492 people across 556.911 square miles. Averaged across its land area, Cass County runs about 49 people per square mile. Within its own EPA zone, Cass County is bigger by population than 54% of the counties that share it. EPA's geology-based Region 7 groups Cass County with 411 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Cass County

Cass 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. Being in Zone 1 raises the odds Cass County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

Testing and mitigation in Cass County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Nebraska's state radon program

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

Where Cass County's figures come from

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