Big Stone County, MN radon potential

Big Stone County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally, Big Stone County ranks higher in radon potential than 71% of rated counties (the 71st percentile).

Big Stone County by the numbers

Big Stone County, Minnesota is home to about 5,067 people across 499.129 square miles. Population density there runs about 10 people per square mile. Within its own EPA zone, Big Stone County is bigger by population than 13% of the counties that share it. Big Stone County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Big Stone County

Big Stone County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. 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 Big Stone County specifically.

Testing and mitigation in Big Stone County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Minnesota's state radon program

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

Where Big Stone County's figures come from

Big Stone 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.