Is Freeborn County, MN a radon risk area?

EPA's own radon map rates Freeborn County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally, Freeborn County ranks higher in radon potential than 85% of rated counties (the 85th percentile).

Freeborn County by the numbers

About 30,314 people live in Freeborn County, Minnesota, spread over 707.246 square miles. Population density there runs about 43 people per square mile. Rank 467 by population within its EPA zone puts Freeborn County at the 56th percentile among zone peers. Geologically, Freeborn County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

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 Freeborn County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. Some Freeborn County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Testing and mitigation in Freeborn County

Nothing about Freeborn County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Minnesota's state radon program

Freeborn County's test kit answers today; a Airthings radon monitor keeps answering for Freeborn County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

Freeborn 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.