Is Red Lake County, MN a radon risk area?

EPA places Red Lake County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Red Lake County ranks higher in radon potential than 69% of rated counties (the 69th percentile).

Where Red Lake County sits nationally

About 3,882 people live in Red Lake County, Minnesota, spread over 432.407 square miles. That works out to roughly 9 people per square mile. Rank 956 by population within its EPA zone puts Red Lake County at the 10th percentile among zone peers. Geologically, Red Lake County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Zone vs. an actual test

Red Lake County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. Some Red Lake County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Testing and mitigation in Red Lake County

Nothing about Red Lake 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

Red Lake County's test kit answers today; a Airthings radon monitor keeps answering for Red Lake 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. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.