Harvard, IL Radon Levels
Check local Harvard radon levels and find certified testing and mitigation professionals to keep your home safe
Harvard, IL Radon Facts
Situated in McHenry County along the northwest suburban corridor of the Chicago metro, Harvard shows concerning radon readings with an average level of 8.0 pCi/L — well above the EPA action threshold. The area's glacial till deposits from Wisconsin glaciation, combined with predominantly full-basement homes built between the 1950s and 1990s, create conditions highly favorable for radon accumulation. Zip code 60033 residents should prioritize radon testing and mitigation given these elevated readings.
Based on 2 user-submitted radon tests for homes in Harvard, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Harvard, IL Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Harvard, IL Radon Levels
User-submitted radon test readings from homes in the Harvard area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 9 pCi/L | Harvard, IL | 0-20 Years | Full Basement |
| 7 pCi/L | Harvard, IL | 51-99 Years | Partial Basement |
Have a radon test result for Harvard? Submit your reading to help other homeowners.
Radon Readings Near Harvard, IL
Compare radon levels in Harvard with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Woodstock | 10.7 mi | 12.50 pCi/L | 2 |
| Marengo | 12.3 mi | 5.50 pCi/L | 2 |
| Poplar Grove | 12.9 mi | 7.00 pCi/L | 2 |
| Belvidere | 16.9 mi | 4.50 pCi/L | 2 |
| Mchenry | 18.3 mi | 11.00 pCi/L | 4 |
| Crystal Lake | 18.6 mi | 7.25 pCi/L | 8 |
| Huntley | 19.3 mi | 5.75 pCi/L | 4 |
| Spring Grove | 19.5 mi | 14.00 pCi/L | 1 |
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.