Is Mille Lacs County, MN a radon risk area?

EPA places Mille Lacs County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 50th percentile for radon potential — Mille Lacs County outranks 50% of every county EPA has rated.

Where Mille Lacs County sits nationally

About 27,577 people live in Mille Lacs County, Minnesota, spread over 572.297 square miles. Averaged across its land area, Mille Lacs County runs about 48 people per square mile. Rank 513 by population within its EPA zone puts Mille Lacs County at the 50th percentile among zone peers. Geologically, Mille Lacs County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Zone vs. an actual test

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Mille Lacs County's Zone 2 prediction lands in the gap between the two. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Mille Lacs County — testing is the only way to know an individual home's actual level.

If Mille Lacs County tests above the action level

Nothing about Mille Lacs County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Minnesota's state radon program

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

More on how this number was built

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.