Is Outagamie County, WI a radon risk area?

Outagamie County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Outagamie County sits at the 62nd percentile nationally for radon potential — above 62 of every 100 rated counties.

Outagamie County by the numbers

About 195,390 people live in Outagamie County, Wisconsin, spread over 637.557 square miles. That works out to roughly 306 people per square mile. Rank 125 by population within its EPA zone puts Outagamie County at the 88th percentile among zone peers. EPA's geology-based Region 5 groups Outagamie County with 523 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Outagamie County

Outagamie 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). Outagamie 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 Outagamie County

Nothing about Outagamie County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Wisconsin's state radon program

Outagamie County's test kit answers today; a Airthings radon monitor keeps answering for Outagamie County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

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