What EPA's radon map says about Barry County

Barry County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Nationally, Barry County ranks higher in radon potential than 57% of rated counties (the 57th percentile).

How Barry County compares

About 64,025 people live in Barry County, Michigan, spread over 553.104 square miles. Averaged across its land area, Barry County runs about 116 people per square mile. Among counties sharing Barry County's EPA zone, it outranks 72% of them by population. EPA's geology-based Region 5 groups Barry County with 523 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Barry County

Barry County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Nothing about a Zone 2 label lowers the case for testing in Barry County — EPA recommends it in every zone, moderate included.

If Barry County tests above the action level

Mitigation cost doesn't depend on Barry County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Michigan's state radon program

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

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Barry County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.