What EPA's radon map says about Goodhue County

Goodhue County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally, Goodhue County ranks higher in radon potential than 90% of rated counties (the 90th percentile).

Where Goodhue County sits nationally

About 47,982 people live in Goodhue County, Minnesota, spread over 756.742 square miles. That works out to roughly 63 people per square mile. Among counties sharing Goodhue County's EPA zone, it outranks 70% of them by population. Geologically, Goodhue County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Goodhue County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. That doesn't mean every Goodhue 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.

If Goodhue County tests above the action level

Mitigation cost doesn't depend on Goodhue 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 Minnesota's state radon program

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

Goodhue County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Goodhue County carries, the zone explainer covers what it does and doesn't tell you about any one house.