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

Lake County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Rank it against the rest of the country and Lake County lands in the 9th percentile for radon potential.

Where Lake County sits nationally

Lake County, Michigan is home to about 13,005 people across 567.595 square miles. Averaged across its land area, Lake County runs about 23 people per square mile. By population, Lake County is the 752nd largest of every county sharing its EPA zone — the 27th percentile by population within that zone. Geologically, Lake County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Lake County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Lake County testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Lake County

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

Where Lake 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. Whatever zone Lake County carries, the zone explainer covers what it does and doesn't tell you about any one house.