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

EPA's own radon map rates Clinton County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally, Clinton County ranks higher in radon potential than 58% of rated counties (the 58th percentile).

Where Clinton County sits nationally

Clinton County, Michigan is home to about 80,050 people across 567.349 square miles. Averaged across its land area, Clinton County runs about 141 people per square mile. By population, Clinton County is the 241st largest of every county sharing its EPA zone — the 77th percentile by population within that zone. EPA's geology-based Region 5 groups Clinton County with 523 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Clinton County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Clinton County — testing is the only way to know an individual home's actual level.

If Clinton County tests above the action level

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

Where Clinton 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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.