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

Leelanau 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. Leelanau County sits at the 47th percentile nationally for radon potential — above 47 of every 100 rated counties.

Leelanau County by the numbers

Leelanau County, Michigan is home to about 22,871 people across 347.2 square miles. That works out to roughly 66 people per square mile. By population, Leelanau County is the 581st largest of every county sharing its EPA zone — the 44th percentile by population within that zone. Leelanau County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Leelanau 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). Middle-of-the-pack doesn't mean risk-free for any one Leelanau County address — a moderate county average still leaves individual homes to test either side of it.

Testing and mitigation in Leelanau County

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

Where Leelanau County's figures come from

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