What EPA's radon map says about Pepin County

Pepin County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. That puts Pepin County in the 73rd percentile nationally for radon potential — higher than 73% of the counties EPA has rated.

Pepin County by the numbers

About 7,555 people live in Pepin County, Wisconsin, spread over 232.008 square miles. That works out to roughly 33 people per square mile. Among counties sharing Pepin County's EPA zone, it outranks 22% of them by population. Geologically, Pepin County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

What this actually means for a house in Pepin County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Pepin County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Pepin County specifically.

Next steps for a home in Pepin County

Mitigation cost doesn't depend on Pepin County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Wisconsin's state radon program

Pepin County's test kit answers today; a Airthings radon monitor keeps answering for Pepin 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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.