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

EPA's own radon map rates Chisago County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally, Chisago County ranks higher in radon potential than 56% of rated counties (the 56th percentile).

How Chisago County compares

Chisago County, Minnesota is home to about 59,105 people across 414.903 square miles. Averaged across its land area, Chisago County runs about 142 people per square mile. By population, Chisago County is the 308th largest of every county sharing its EPA zone — the 70th percentile by population within that zone. Chisago County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Chisago County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). A county-wide moderate average, like Chisago County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in Chisago County

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

Where Chisago County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Chisago County's numbers. Whatever zone Chisago County carries, the zone explainer covers what it does and doesn't tell you about any one house.