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

Stevens County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally that's the 75th percentile for radon potential — Stevens County outranks 75% of every county EPA has rated.

Where Stevens County sits nationally

Stevens County, Minnesota is home to about 9,819 people across 563.662 square miles. Averaged across its land area, Stevens County runs about 17 people per square mile. By population, Stevens County is the 769th largest of every county sharing its EPA zone — the 28th percentile by population within that zone. Geologically, Stevens County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

What this actually means for a house in Stevens County

Where the national indoor average runs about 1.3 pCi/L, Stevens County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Stevens County specifically.

Testing and mitigation in Stevens County

For a Stevens 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 Stevens County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Stevens 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 Stevens County's figures come from

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.