What EPA's radon map says about Barron County

EPA places Barron County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Barron County in the 55th percentile nationally for radon potential — higher than 55% of the counties EPA has rated.

Barron County by the numbers

About 46,810 people live in Barron County, Wisconsin, spread over 863.083 square miles. That works out to roughly 54 people per square mile. Among counties sharing Barron County's EPA zone, it outranks 66% of them by population. Barron County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Barron County

Barron County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. Nothing about a Zone 2 label lowers the case for testing in Barron County — EPA recommends it in every zone, moderate included.

Next steps for a home in Barron County

Mitigation cost doesn't depend on Barron 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

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

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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.