Seward County, NE radon potential

EPA's own radon map rates Seward County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally that's the 81st percentile for radon potential — Seward County outranks 81% of every county EPA has rated.

Seward County by the numbers

Seward County, Nebraska is home to about 17,769 people across 571.431 square miles. That works out to roughly 31 people per square mile. Within its own EPA zone, Seward County is bigger by population than 43% of the counties that share it. EPA's geology-based Region 7 groups Seward County with 411 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Seward County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Seward County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Seward County specifically.

Testing and mitigation in Seward 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 Seward County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Seward 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 Seward County's figures come from

Seward County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Seward County carries, the zone explainer covers what it does and doesn't tell you about any one house.