McLeod County, MN radon potential

EPA's own radon map rates McLeod County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts McLeod County in the 87th percentile nationally for radon potential — higher than 87% of the counties EPA has rated.

How McLeod County compares

McLeod County, Minnesota is home to about 36,780 people across 491.51 square miles. That works out to roughly 75 people per square mile. Within its own EPA zone, McLeod County is bigger by population than 62% of the counties that share it. McLeod 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 McLeod County

McLeod 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. That doesn't mean every McLeod 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 McLeod County tests above the action level

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

McLeod County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.