Portage, WI Radon Levels
Check local Portage radon levels and find certified testing and mitigation professionals to keep your home safe
Portage, WI Radon Facts
Portage in Columbia County recorded a notably high radon reading of 9.0 pCi/L, more than doubling the EPA's 4.0 pCi/L action threshold. This Madison metro area community sits on glacial deposits over sandstone bedrock, geological conditions known to produce elevated radon levels in south-central Wisconsin. Homeowners in zip code 53901 should prioritize radon testing and mitigation, particularly in homes with basements or lower-level living spaces.
Based on 1 user-submitted radon test for homes in Portage, WI. The EPA recommends taking action at or above 4.0 pCi/L.
Portage, WI Radon Mitigation
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Portage, WI Radon Levels
User-submitted radon test readings from homes in the Portage area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 9 pCi/L | Portage, WI | 0-20 Years | Full Basement |
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Radon Readings Near Portage, WI
Compare radon levels in Portage with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Pardeeville | 7.3 mi | 4.00 pCi/L | 1 |
| Arlington | 16.4 mi | 6.00 pCi/L | 1 |
| Fall River | 23.0 mi | 10.00 pCi/L | 1 |
| Waunakee | 25.5 mi | 5.50 pCi/L | 2 |
| Reedsburg | 26.3 mi | 5.00 pCi/L | 1 |
| Middleton | 30.8 mi | 4.00 pCi/L | 1 |
| Beaver Dam | 32.2 mi | 10.00 pCi/L | 1 |
| Green Lake | 32.3 mi | 6.00 pCi/L | 1 |
Columbia County Radon Profile
EPA mapping assigns Columbia County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 4 cities in Columbia County average 7.25 pCi/L across 4 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Columbia County home regardless of zone or a neighbor's results.