Is Iron County, WI a radon risk area?

Iron 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. Rank it against the rest of the country and Iron County lands in the 37th percentile for radon potential.

Iron County by the numbers

About 6,235 people live in Iron County, Wisconsin, spread over 758.214 square miles. Averaged across its land area, Iron County runs about 8 people per square mile. Rank 916 by population within its EPA zone puts Iron County at the 11th percentile among zone peers. Geologically, Iron 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 Iron County

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Iron County's Zone 2 prediction. A county-wide moderate average, like Iron County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Testing and mitigation in Iron County

Nothing about Iron 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

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

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