Is Mecosta County, MI a radon risk area?

EPA's own radon map rates Mecosta County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally, Mecosta County ranks higher in radon potential than 20% of rated counties (the 20th percentile).

How Mecosta County compares

About 41,947 people live in Mecosta County, Michigan, spread over 555.157 square miles. Averaged across its land area, Mecosta County runs about 76 people per square mile. Rank 393 by population within its EPA zone puts Mecosta County at the 62nd percentile among zone peers. EPA's geology-based Region 5 groups Mecosta County with 523 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

At Zone 3, Mecosta 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 rating means Mecosta County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Next steps for a home in Mecosta County

Nothing about Mecosta 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

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

Mecosta 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.