What EPA's radon map says about Lake County

Lake 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. That puts Lake County in the 40th percentile nationally for radon potential — higher than 40% of the counties EPA has rated.

How Lake County compares

About 10,698 people live in Lake County, Minnesota, spread over 2,109.108 square miles. Averaged across its land area, Lake County runs about 5 people per square mile. Among counties sharing Lake County's EPA zone, it outranks 22% of them by population. Geologically, Lake County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Zone vs. an actual test

EPA's Zone 2 rating for Lake County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Middle-of-the-pack doesn't mean risk-free for any one Lake County address — a moderate county average still leaves individual homes to test either side of it.

Next steps for a home in Lake County

Mitigation cost doesn't depend on Lake 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 Minnesota's state radon program

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

More on how this number was built

Lake County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.