Dunn County, WI radon potential

EPA places Dunn 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 Dunn County lands in the 55th percentile for radon potential.

Where Dunn County sits nationally

Dunn County, Wisconsin is home to about 46,135 people across 850.16 square miles. Averaged across its land area, Dunn County runs about 54 people per square mile. Within its own EPA zone, Dunn County is bigger by population than 65% of the counties that share it. Dunn County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Dunn County's Zone 2 prediction. Dunn County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Next steps for a home in Dunn 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 Wisconsin's state radon program

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

Where Dunn County's figures come from

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