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

Sherburne County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Sherburne County sits at the 94th percentile nationally for radon potential — above 94 of every 100 rated counties.

Where Sherburne County sits nationally

Sherburne County, Minnesota is home to about 103,059 people across 432.947 square miles. Population density there runs about 238 people per square mile. By population, Sherburne County is the 189th largest of every county sharing its EPA zone — the 82nd percentile by population within that zone. EPA's geology-based Region 5 groups Sherburne County with 523 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Sherburne County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. That doesn't mean every Sherburne County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

If Sherburne County tests above the action level

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

The methodology guide shows exactly which EPA and Census sources feed Sherburne County's numbers. Whatever zone Sherburne County carries, the zone explainer covers what it does and doesn't tell you about any one house.