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

Jackson County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally that's the 96th percentile for radon potential — Jackson County outranks 96% of every county EPA has rated.

Where Jackson County sits nationally

Jackson County, Michigan is home to about 160,233 people across 701.905 square miles. Population density there runs about 228 people per square mile. By population, Jackson County is the 126th largest of every county sharing its EPA zone — the 88th percentile by population within that zone. Jackson 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 Jackson County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Jackson County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. That doesn't mean every Jackson County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Testing and mitigation in Jackson County

For a Jackson 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 Jackson County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Jackson 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 Jackson 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.