Is Huron County, MI a radon risk area?

EPA places Huron County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 18th percentile for radon potential — Huron County outranks 18% of every county EPA has rated.

Where Huron County sits nationally

About 30,780 people live in Huron County, Michigan, spread over 835.917 square miles. That works out to roughly 37 people per square mile. Rank 475 by population within its EPA zone puts Huron County at the 54th percentile among zone peers. Geologically, Huron 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 Huron County

At Zone 3, Huron County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. A Zone 3 label describes Huron County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Huron County tests above the action level

Nothing about Huron 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 Michigan's state radon program

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

More on how this number was built

Huron County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.