Le Sueur County, MN: EPA's radon zone, explained

EPA places Le Sueur County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Le Sueur County in the 85th percentile nationally for radon potential — higher than 85% of the counties EPA has rated.

How Le Sueur County compares

Le Sueur County, Minnesota is home to about 29,458 people across 448.756 square miles. Averaged across its land area, Le Sueur County runs about 66 people per square mile. By population, Le Sueur County is the 471st largest of every county sharing its EPA zone — the 56th percentile by population within that zone. Geologically, Le Sueur County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Zone vs. an actual test

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Le Sueur County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. That doesn't mean every Le Sueur 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.

Next steps for a home in Le Sueur County

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

Where Le Sueur County's figures come from

Le Sueur 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.