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

Wilkin County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally, Wilkin County ranks higher in radon potential than 72% of rated counties (the 72nd percentile).

How Wilkin County compares

Wilkin County, Minnesota is home to about 6,268 people across 751.038 square miles. That works out to roughly 8 people per square mile. By population, Wilkin County is the 873rd largest of every county sharing its EPA zone — the 18th percentile by population within that zone. Wilkin County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Wilkin 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. Being in Zone 1 raises the odds Wilkin County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

Next steps for a home in Wilkin County

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

Where Wilkin County's figures come from

Wilkin County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.