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

EPA's own radon map rates Kewaunee County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally, Kewaunee County ranks higher in radon potential than 46% of rated counties (the 46th percentile).

How Kewaunee County compares

Kewaunee County, Wisconsin is home to about 20,751 people across 342.453 square miles. Population density there runs about 61 people per square mile. By population, Kewaunee County is the 613th largest of every county sharing its EPA zone — the 41st percentile by population within that zone. Kewaunee 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

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Kewaunee County's Zone 2 prediction lands in the gap between the two. Kewaunee 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 Kewaunee County

For a Kewaunee 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 Kewaunee County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Kewaunee 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 Kewaunee County's figures come from

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