Is radon high in Koochiching County, Minnesota?

Moderate. The model predicts a long-term basement average of 2.0 pCi/L in Koochiching County (close to the US average of 1.8 and about 17% below the Minnesota average of 2.4). That is in the 2-4 pCi/L range where the EPA recommends considering mitigation. Ranked 80 of 87 Minnesota counties.

Should I test for radon in Koochiching County?

Yes, soon. With a predicted average of 2.0 pCi/L, many homes in Koochiching County will test above the 4 pCi/L action level. Use a short-term kit first; if it reads 2 or higher, confirm with a long-term test or continuous monitor before deciding on mitigation.

What does EPA Radon Zone 2 mean for Koochiching County?

Zone 2 - moderate potential (2-4 pCi/L). The zone map dates from 1993 and classifies whole counties. The 2001-2021 model agrees with the zone here. Neither replaces a test of your own home.

How much does radon mitigation cost in Koochiching County?

A standard active sub-slab depressurization system typically runs $800-$2,500 installed nationally; Minnesota quotes vary with foundation type (slab, crawlspace, basement), home size and local labor. Get two or three bids from certified mitigators listed by your state radon program or the EPA's find-a-professional page.

Radon levels in Koochiching County, Minnesota

ModerateEPA Zone 2

Predicted long-term basement average of 2.0 pCi/L (model estimate) across 7 ZIP codes - close to the US average of 1.8, about 17% below the Minnesota average of 2.4. Ranked #80 of 87 Minnesota counties.

Test Koochiching County, MN - the EPA says "consider fixing" in this range

The predicted basement average here is 2.0 pCi/L, in the 2-4 pCi/L band where the EPA recommends considering mitigation. Plenty of individual homes in a moderate area test above 4. Start with a short-term test; if it comes back at 2 or higher, follow up with a long-term test or a continuous monitor.

Get a short-term test kit →Or track it with a continuous monitor

Already tested at 4 pCi/L or higher? Find a certified mitigation professional (EPA). A mitigation system typically runs $800-$2,500 installed.

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Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. Measured Minnesota test results are shown separately and labeled as such. How the numbers work.

2.0 ± 0.06

pCi/L predicted basement mean (model SD)

1.0 ± 0.07

pCi/L predicted upstairs (above-ground) mean

1.7-2.2

range of ZIP-level basement predictions in the county

Measured tests in Koochiching County (Minnesota Dept. of Health, 2016-2025)

Actual results from voluntary home tests, separate from the model above. Measured averages usually run higher than the model because tests skew toward basements and worried homeowners.

Mean: 2.9 pCi/L
Median: 2.1 pCi/L
Tests ≥ 4 pCi/L: 28.4%
Tests per year: 15

Source: MN Public Health Data Access.

What this means for Koochiching

The typical Koochiching County home is predicted in the 2-4 pCi/L band. The EPA's guidance for this range is to consider fixing, because there is no known safe level and roughly one home in several in a moderate area will test above 4.

The 1993 EPA zone (2) and the 2001-2021 model agree for Koochiching. County figures weight each ZIP by its 2010 Census population, so they describe where people live rather than empty land.

Comparable Minnesota counties: Ramsey County (2.0), Isanti County (2.0), Mille Lacs County (2.1), Lake of the Woods County (2.0). The state's highest is Rock County at 4.7 pCi/L.

ZIP codes in Koochiching County

Predicted basement and upstairs means by ZIP (model estimate). ZIPs whose land is mostly in this county.

ZIP	Basement	Upstairs	Grade
56649	2.0 ± 0.06	1.0	Moderate
56653	2.1 ± 0.06	1.1	Moderate
56661	2.2 ± 0.05	1.1	Moderate
56669	1.8 ± 0.06	0.9	Low
56627	1.7 ± 0.07	0.8	Low
56660	1.9 ± 0.06	1.1	Low
56654	1.9 ± 0.07	1.0	Low

If your test comes back at 4 pCi/L or higher

Mitigation is a routine job: a fan-driven pipe that vents soil gas from under the slab to above the roofline, typically $800-$2,500 installed (typical range; local quotes vary). Use certified professionals: EPA find-a-professional. Read the full mitigation guide.

Koochiching County radon questions

Is radon high in Koochiching County, Minnesota?: Moderate. The model predicts a long-term basement average of 2.0 pCi/L in Koochiching County (close to the US average of 1.8 and about 17% below the Minnesota average of 2.4). That is in the 2-4 pCi/L range where the EPA recommends considering mitigation. Ranked 80 of 87 Minnesota counties.
Should I test for radon in Koochiching County?: Yes, soon. With a predicted average of 2.0 pCi/L, many homes in Koochiching County will test above the 4 pCi/L action level. Use a short-term kit first; if it reads 2 or higher, confirm with a long-term test or continuous monitor before deciding on mitigation.
What does EPA Radon Zone 2 mean for Koochiching County?: Zone 2 - moderate potential (2-4 pCi/L). The zone map dates from 1993 and classifies whole counties. The 2001-2021 model agrees with the zone here. Neither replaces a test of your own home.
How much does radon mitigation cost in Koochiching County?: A standard active sub-slab depressurization system typically runs $800-$2,500 installed nationally; Minnesota quotes vary with foundation type (slab, crawlspace, basement), home size and local labor. Get two or three bids from certified mitigators listed by your state radon program or the EPA's find-a-professional page.

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