Roscommon County, MI: EPA's radon zone, explained

EPA's own radon map rates Roscommon County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally, Roscommon County ranks higher in radon potential than 15% of rated counties (the 15th percentile).

Where Roscommon County sits nationally

Roscommon County, Michigan is home to about 23,932 people across 519.897 square miles. Population density there runs about 46 people per square mile. By population, Roscommon County is the 553rd largest of every county sharing its EPA zone — the 46th percentile by population within that zone. EPA's geology-based Region 5 groups Roscommon County with 523 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Roscommon County

A Zone 3 county like Roscommon County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Roscommon County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Roscommon County

For a Roscommon County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Michigan's state radon program

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

Where Roscommon County's figures come from

Roscommon 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.