Chicago, IL Radon Levels
Check local Chicago radon levels and find certified testing and mitigation professionals to keep your home safe
Chicago, IL Radon Facts
Illinois's largest city in Cook County shows an average radon level of 11.0 pCi/L based on recent testing across multiple ZIP codes, significantly exceeding the EPA's 4.0 pCi/L action threshold. Located along the northern suburban corridor where glacial till deposits from the Wisconsin glaciation create soil conditions highly favorable for radon gas production and migration, Chicago's predominantly single-family homes with full poured-concrete or block basements provide enclosed below-grade spaces where radon accumulates most readily. With readings ranging from 2.0 to 20.0 pCi/L, residents should prioritize professional testing and strongly consider mitigation systems.
Based on 3 user-submitted radon tests for homes in Chicago, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Chicago, IL Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Chicago, IL Radon Levels
User-submitted radon test readings from homes in the Chicago area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 20 pCi/L | Chicago, IL | 0-20 Years | Full Basement |
| 2 pCi/L | Chicago, IL | 100+ Years | Full Basement |
| 11 pCi/L | Chicago, IL | 0-20 Years | — |
Have a radon test result for Chicago? Submit your reading to help other homeowners.
Radon Readings Near Chicago, IL
Compare radon levels in Chicago with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Oak Park | 6.1 mi | 5.33 pCi/L | 3 |
| Berwyn | 6.3 mi | 5.00 pCi/L | 1 |
| Forest Park | 7.0 mi | 7.00 pCi/L | 2 |
| River Forest | 7.5 mi | 4.00 pCi/L | 1 |
| Riverside | 7.7 mi | 8.00 pCi/L | 1 |
| Burbank | 9.7 mi | 2.00 pCi/L | 1 |
| Westchester | 10.8 mi | 4.00 pCi/L | 1 |
| Western Springs | 12.3 mi | 7.00 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 40 cities in Cook County average 6.44 pCi/L across 82 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.