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

Benton County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Benton County sits at the 54th percentile nationally for radon potential — above 54 of every 100 rated counties.

Where Benton County sits nationally

Benton County, Minnesota is home to about 41,881 people across 408.303 square miles. That works out to roughly 103 people per square mile. By population, Benton County is the 390th largest of every county sharing its EPA zone — the 62nd percentile by population within that zone. EPA's geology-based Region 5 groups Benton County with 523 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Benton County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Benton County's Zone 2 prediction lands in the gap between the two. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Benton County — testing is the only way to know an individual home's actual level.

Testing and mitigation in Benton County

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

Benton County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Benton County carries, the zone explainer covers what it does and doesn't tell you about any one house.