Is Roseau County, MN a radon risk area?

EPA places Roseau 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. Roseau County sits at the 79th percentile nationally for radon potential — above 79 of every 100 rated counties.

Where Roseau County sits nationally

About 15,265 people live in Roseau County, Minnesota, spread over 1,671.739 square miles. Population density there runs about 9 people per square mile. Rank 654 by population within its EPA zone puts Roseau County at the 39th percentile among zone peers. EPA's geology-based Region 5 groups Roseau County with 523 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Roseau County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Roseau County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Roseau County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Roseau County

Nothing about Roseau 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

Roseau County's test kit answers today; a Airthings radon monitor keeps answering for Roseau 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

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.