Iosco County, MI radon potential

EPA's own radon map rates Iosco County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rank it against the rest of the country and Iosco County lands in the 16th percentile for radon potential.

Where Iosco County sits nationally

Iosco County, Michigan is home to about 25,361 people across 549.477 square miles. That works out to roughly 46 people per square mile. Within its own EPA zone, Iosco County is bigger by population than 48% of the counties that share it. Iosco 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 Iosco County

At Zone 3, Iosco 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 Iosco County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Next steps for a home in Iosco County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Michigan's state radon program

For Iosco County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Iosco County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Iosco County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Iosco County carries, the zone explainer covers what it does and doesn't tell you about any one house.