Stillman Valley, IL Radon Levels
Check local Stillman Valley radon levels and find certified testing and mitigation professionals to keep your home safe
Stillman Valley, IL Radon Facts
Positioned in Ogle County near the Rockford Metro area, Stillman Valley recorded an average radon level of 5.0 pCi/L, which exceeds the EPA action threshold of 4.0 pCi/L. The area's glacial till soils over limestone bedrock contribute to elevated radon potential throughout north-central Illinois. Homes in zip code 61084 should be tested regularly, particularly those with full basements common in this region.
Based on 1 user-submitted radon test for homes in Stillman Valley, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Stillman Valley, IL Radon Mitigation
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Stillman Valley, IL Radon Levels
User-submitted radon test readings from homes in the Stillman Valley area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 5 pCi/L | Stillman Valley, IL | 0-20 Years | Full Basement |
Have a radon test result for Stillman Valley? Submit your reading to help other homeowners.
Radon Readings Near Stillman Valley, IL
Compare radon levels in Stillman Valley with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Byron | 4.0 mi | 11.50 pCi/L | 2 |
| Mount Morris | 13.5 mi | 4.00 pCi/L | 1 |
| Rochelle | 14.5 mi | 13.00 pCi/L | 1 |
| Pecatonica | 15.2 mi | 11.00 pCi/L | 1 |
| Ashton | 17.6 mi | 4.00 pCi/L | 1 |
| Belvidere | 19.9 mi | 4.50 pCi/L | 2 |
| Kingston | 21.6 mi | 13.00 pCi/L | 1 |
| Roscoe | 23.2 mi | 5.50 pCi/L | 2 |
Ogle County Radon Profile
Because of its underlying geology, Ogle County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 4 cities in Ogle County average 9.00 pCi/L across 5 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 Ogle County home regardless of zone or a neighbor's results.