Beltrami County, MN: EPA's radon zone, explained

EPA places Beltrami 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, Beltrami County ranks higher in radon potential than 55% of rated counties (the 55th percentile).

Where Beltrami County sits nationally

Beltrami County, Minnesota is home to about 46,762 people across 2,504.643 square miles. That works out to roughly 19 people per square mile. By population, Beltrami County is the 354th largest of every county sharing its EPA zone — the 66th percentile by population within that zone. EPA's geology-based Region 5 groups Beltrami County with 523 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Beltrami County's Zone 2 prediction lands in the gap between the two. Beltrami County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

If Beltrami County tests above the action level

For a Beltrami 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 Minnesota's state radon program

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

Where Beltrami County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Beltrami County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.