Knoxville, IL Radon Levels
Check local Knoxville radon levels and find certified testing and mitigation professionals to keep your home safe
Knoxville, IL Radon Facts
Located in Knox County in western Illinois, Knoxville has recorded an average radon level of 8.0 pCi/L, which exceeds the EPA's action level of 4.0 pCi/L. This agricultural community in zip code 61448 sits on glacial deposits over limestone bedrock, geological conditions that contribute to radon production and migration into homes with basements common throughout rural Illinois.
Based on 1 user-submitted radon test for homes in Knoxville, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Knoxville, IL Radon Mitigation
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Knoxville, IL Radon Levels
User-submitted radon test readings from homes in the Knoxville area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 8 pCi/L | Knoxville, IL | 51-99 Years | Full Basement |
Have a radon test result for Knoxville? Submit your reading to help other homeowners.
Radon Readings Near Knoxville, IL
Compare radon levels in Knoxville with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Monmouth | 18.7 mi | 8.00 pCi/L | 1 |
| New Windsor | 21.8 mi | 6.00 pCi/L | 1 |
| Cuba | 28.9 mi | 6.00 pCi/L | 1 |
| Kewanee | 29.5 mi | 8.00 pCi/L | 1 |
| Orion | 31.7 mi | 4.00 pCi/L | 1 |
| Dunlap | 34.1 mi | 7.00 pCi/L | 1 |
| Stronghurst | 35.1 mi | 13.00 pCi/L | 2 |
| Mapleton | 36.2 mi | 8.00 pCi/L | 1 |
Knox County Radon Profile
The bedrock and soils beneath Knox 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 1 city in Knox County average 8.00 pCi/L across 1 test — 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 Knox County.