Crystal Lake, IL Radon Levels
Check local Crystal Lake radon levels and find certified testing and mitigation professionals to keep your home safe
Crystal Lake, IL Radon Facts
This northwest Chicago suburb in McHenry County shows an average radon level of 7.25 pCi/L, significantly exceeding the EPA action threshold of 4.0 pCi/L. Built primarily on glacial till deposits over limestone bedrock, the area's predominantly single-family homes with full basements create ideal conditions for radon accumulation. Testing data from zip codes 60012 and 60014 confirms that Crystal Lake homeowners should take immediate action to test and, if necessary, mitigate elevated radon levels in their properties.
Based on 9 user-submitted radon tests for homes in Crystal Lake, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Crystal Lake, IL Radon Mitigation
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Crystal Lake, IL Radon Levels
User-submitted radon test readings from homes in the Crystal Lake area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 5 pCi/L | Crystal Lake, IL | 0-20 Years | Full Basement |
| 8 pCi/L | Crystal Lake, IL | 21-50 Years | Full Basement |
| 7 pCi/L | Crystal Lake, IL | 51-99 Years | Full Basement |
| 4 pCi/L | Crystal Lake, IL | 51-99 Years | Full Basement |
| 10 pCi/L | Crystal Lake, IL | 0-20 Years | Full Basement |
Have a radon test result for Crystal Lake? Submit your reading to help other homeowners.
Radon Readings Near Crystal Lake, IL
Compare radon levels in Crystal Lake with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Lake In The Hills | 4.6 mi | 6.50 pCi/L | 4 |
| Cary | 4.8 mi | 6.00 pCi/L | 3 |
| Algonquin | 5.9 mi | 5.00 pCi/L | 2 |
| Fox River Grove | 6.6 mi | 10.00 pCi/L | 1 |
| Huntley | 7.2 mi | 5.75 pCi/L | 4 |
| Mchenry | 7.3 mi | 11.00 pCi/L | 4 |
| Woodstock | 7.9 mi | 12.50 pCi/L | 2 |
| Wauconda | 10.0 mi | 6.67 pCi/L | 3 |
McHenry County Radon Profile
EPA mapping assigns McHenry 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 11 cities in McHenry County average 7.73 pCi/L across 33 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 McHenry County home regardless of zone or a neighbor's results.