Marseilles, IL Radon Levels
Check local Marseilles radon levels and find certified testing and mitigation professionals to keep your home safe
Marseilles, IL Radon Facts
Situated along the Illinois River in La Salle County, Marseilles has recorded an average radon level of 9.0 pCi/L, significantly exceeding the EPA action level. The community sits where Illinois River valley alluvial soils meet underlying Ordovician limestone, creating conditions highly favorable for radon gas production and migration. Residents should prioritize radon testing and mitigation given these consistently elevated readings.
Based on 1 user-submitted radon test for homes in Marseilles, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Marseilles, IL Radon Mitigation
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Marseilles, IL Radon Levels
User-submitted radon test readings from homes in the Marseilles area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 9 pCi/L | Marseilles, IL | 21-50 Years | Partial Basement |
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Radon Readings Near Marseilles, IL
Compare radon levels in Marseilles with the closest nearby cities that have user-submitted test data.
La Salle County Radon Profile
The bedrock and soils beneath La Salle County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. Homeowner-submitted tests from 4 cities in La Salle County average 8.00 pCi/L across 5 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 La Salle County.