Cortland, IL Radon Levels
Check local Cortland radon levels and find certified testing and mitigation professionals to keep your home safe
Cortland, IL Radon Facts
Positioned in DeKalb County within the Chicago Metro's northwest suburban belt, Cortland recorded an average radon level of 5.0 pCi/L that exceeds the EPA action threshold. The area's glacial till deposits from the Wisconsin glaciation create soil conditions highly favorable for radon gas production and migration. Homeowners in zip code 60112 should consider radon mitigation systems, as the region's geology and typical full-basement construction combine to elevate indoor radon accumulation risks.
Based on 1 user-submitted radon test for homes in Cortland, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Cortland, IL Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Cortland, IL Radon Levels
User-submitted radon test readings from homes in the Cortland area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 5 pCi/L | Cortland, IL | 21-50 Years | Full Basement |
Have a radon test result for Cortland? Submit your reading to help other homeowners.
Radon Readings Near Cortland, IL
Compare radon levels in Cortland with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Dekalb | 3.6 mi | 8.75 pCi/L | 4 |
| Sycamore | 4.9 mi | 16.00 pCi/L | 2 |
| Kingston | 13.5 mi | 13.00 pCi/L | 1 |
| Sugar Grove | 16.3 mi | 7.00 pCi/L | 1 |
| Saint Charles | 17.5 mi | 18.00 pCi/L | 1 |
| Plano | 19.1 mi | 10.00 pCi/L | 1 |
| Geneva | 19.6 mi | 7.00 pCi/L | 2 |
| Rochelle | 19.7 mi | 13.00 pCi/L | 1 |
Dekalb County Radon Profile
Because of its underlying geology, Dekalb County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 4 cities in Dekalb County average 10.63 pCi/L across 8 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 Dekalb County home regardless of zone or a neighbor's results.