Grand Portage, MN Radon Levels
Check local Grand Portage radon levels and find certified testing and mitigation professionals to keep your home safe
Grand Portage, MN Radon Facts
Located at Minnesota's northeastern tip in Cook County, Grand Portage has recorded an exceptionally high radon reading of 16.0 pCi/L. This level significantly exceeds EPA action guidelines, likely reflecting the area's complex geology where ancient Precambrian rocks meet Lake Superior's shoreline. Given this elevated reading in zip code 55605, local residents should prioritize radon testing and mitigation measures.
Based on 1 user-submitted radon test for homes in Grand Portage, MN. The EPA recommends taking action at or above 4.0 pCi/L.
Grand Portage, MN Radon Mitigation
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Grand Portage, MN Radon Levels
User-submitted radon test readings from homes in the Grand Portage area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 16 pCi/L | Grand Portage, MN | 0-20 Years | Full Basement |
Have a radon test result for Grand Portage? Submit your reading to help other homeowners.
Radon Readings Near Grand Portage, MN
Compare radon levels in Grand Portage with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Grand Marais | 32.3 mi | 8.00 pCi/L | 1 |
Cook County Radon Profile
Cook County is mapped as EPA Radon Zone 2, where the local geology is predicted to produce moderate indoor screening levels between 2 and 4 pCi/L. Homeowner-submitted tests from 2 cities in Cook County average 12.00 pCi/L across 2 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Cook County.