Joliet, IL Radon Levels
Check local Joliet radon levels and find certified testing and mitigation professionals to keep your home safe
Joliet, IL Radon Facts
Positioned in Will County within the southern suburban reaches of the Chicago metro, Joliet's radon levels average 6.67 pCi/L - exceeding the EPA action threshold of 4.0 pCi/L. The area's glacial till deposits over limestone bedrock, combined with predominantly postwar housing featuring full poured-concrete basements in zip code 60431, create conditions highly favorable for radon accumulation.
Based on 3 user-submitted radon tests for homes in Joliet, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Joliet, IL Radon Mitigation
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Joliet, IL Radon Levels
User-submitted radon test readings from homes in the Joliet area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 5 pCi/L | Joliet, IL | 21-50 Years | Partial Basement |
| 8 pCi/L | Joliet, IL | 0-20 Years | No Basement/All Slab |
| 7 pCi/L | Joliet, IL | 21-50 Years | Full Basement |
Have a radon test result for Joliet? Submit your reading to help other homeowners.
Radon Readings Near Joliet, IL
Compare radon levels in Joliet with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Crest Hill | 3.4 mi | 6.00 pCi/L | 1 |
| New Lenox | 5.4 mi | 10.14 pCi/L | 7 |
| Lockport | 5.7 mi | 12.50 pCi/L | 2 |
| Manhattan | 7.4 mi | 8.00 pCi/L | 1 |
| Shorewood | 7.7 mi | 4.00 pCi/L | 1 |
| Homer Glen | 8.5 mi | 4.33 pCi/L | 3 |
| Romeoville | 8.9 mi | 15.00 pCi/L | 1 |
| Mokena | 9.3 mi | 5.67 pCi/L | 3 |
Will County Radon Profile
EPA mapping assigns Will 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 16 cities in Will County average 8.00 pCi/L across 30 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 Will County home regardless of zone or a neighbor's results.