What EPA's radon map says about Bayfield County

EPA's own radon map rates Bayfield County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Bayfield County lands in the 44th percentile for radon potential.

How Bayfield County compares

About 16,838 people live in Bayfield County, Wisconsin, spread over 1,477.882 square miles. Population density there runs about 11 people per square mile. Among counties sharing Bayfield County's EPA zone, it outranks 34% of them by population. EPA's geology-based Region 5 groups Bayfield County with 523 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Bayfield County's Zone 2 prediction lands in the gap between the two. Nothing about a Zone 2 label lowers the case for testing in Bayfield County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Bayfield County

Mitigation cost doesn't depend on Bayfield 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

Bayfield County's test kit answers today; a Airthings radon monitor keeps answering for Bayfield 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 Bayfield County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.