Dodge County, WI: EPA's radon zone, explained

EPA's own radon map rates Dodge County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Dodge County sits at the 93rd percentile nationally for radon potential — above 93 of every 100 rated counties.

Dodge County by the numbers

Dodge County, Wisconsin is home to about 88,635 people across 875.699 square miles. That works out to roughly 101 people per square mile. By population, Dodge County is the 212th largest of every county sharing its EPA zone — the 80th percentile by population within that zone. Dodge County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Dodge County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Dodge County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. That doesn't mean every Dodge County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Testing and mitigation in Dodge County

For a Dodge County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Wisconsin's state radon program

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

Where Dodge County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.