Granite City, IL Radon Mitigation and Testing
Located on the Illinois side of the St. Louis metro in Madison County, Granite City recorded an average radon level of 8.0 pCi/L from initial testing, significantly exceeding EPA action levels. The community's Mississippi River floodplain deposits over underlying Mississippian limestone create variable radon conditions throughout zip code 62040. With its mix of mid-century homes and slab-on-grade construction, residents should prioritize professional radon testing and mitigation.
Based on 1 user-submitted radon test for homes in Granite City, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Granite City, IL Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
Granite City, IL Radon Testing
Finding qualified radon testing professionals is the first step toward protecting your home.
Granite City, Illinois Radon Levels
User-submitted radon test readings from homes in the Granite City area.
| Radon Level | City | Home Age | Foundation | Submitted |
|---|---|---|---|---|
| 8 pCi/L | Granite City, IL | 0-20 Years | Full Basement | Nov 2020 |
Have a radon test result for Granite City? Submit your reading to help other homeowners.
Granite City Radon Facts
Key details about the radon risk profile for Granite City and the 62040 zip code area.
Granite City and the 62040 zip code are located in Madison County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.
Radon FAQ for Granite City, IL
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Most Active Radon Markets in Illinois
Cities with the most user-submitted radon test data in the state.
| City | Avg User Radon Level | Submissions |
|---|---|---|
| Buffalo Grove | 6.10 pCi/L | 10 |
| Crystal Lake | 7.25 pCi/L | 8 |
| Lake Zurich | 6.00 pCi/L | 7 |
| Grayslake | 5.00 pCi/L | 7 |
| New Lenox | 10.17 pCi/L | 6 |
| Park Ridge | 7.00 pCi/L | 6 |
| Arlington Heights | 6.17 pCi/L | 6 |
| Waterloo | 9.20 pCi/L | 5 |
| Palatine | 7.80 pCi/L | 5 |
| Round Lake | 7.80 pCi/L | 5 |
| Northbrook | 6.20 pCi/L | 5 |
| Mchenry | 11.00 pCi/L | 4 |
| Dekalb | 8.75 pCi/L | 4 |
| Columbia | 8.00 pCi/L | 4 |
| Lisle | 7.25 pCi/L | 4 |
| Normal | 7.25 pCi/L | 4 |
| Antioch | 7.00 pCi/L | 4 |
| Elk Grove Village | 7.00 pCi/L | 4 |
| Aurora | 6.75 pCi/L | 4 |
| Hoffman Estates | 6.75 pCi/L | 4 |