Sioux County, NE radon potential

EPA places Sioux County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 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 Sioux County lands in the 33rd percentile for radon potential.

Where Sioux County sits nationally

Sioux County, Nebraska is home to about 1,099 people across 2,066.723 square miles. Averaged across its land area, Sioux County runs about 1 people per square mile. Within its own EPA zone, Sioux County is bigger by population than 1% of the counties that share it. EPA's geology-based Region 7 groups Sioux County with 411 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Sioux County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Nothing about a Zone 2 label lowers the case for testing in Sioux County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Sioux 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 Sioux County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Sioux County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Sioux County's figures come from

Sioux County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.