Charleston, IL Radon Levels
Check local Charleston radon levels and find certified testing and mitigation professionals to keep your home safe
Charleston, IL Radon Facts
Home to Eastern Illinois University in Coles County, Charleston has recorded a notable radon reading of 8.0 pCi/L, doubling the EPA action level. The community sits atop central Illinois's characteristic glacial moraine deposits over limestone bedrock, geological conditions known for supporting radon gas production and migration. Given this documented elevated reading in zip code 61920, both university housing and private residences should prioritize radon testing and mitigation where necessary.
Based on 1 user-submitted radon test for homes in Charleston, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Charleston, IL Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Charleston, IL Radon Levels
User-submitted radon test readings from homes in the Charleston area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 8 pCi/L | Charleston, IL | 21-50 Years | Full Basement |
Have a radon test result for Charleston? Submit your reading to help other homeowners.
Radon Readings Near Charleston, IL
Compare radon levels in Charleston with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Mattoon | 10.7 mi | 9.33 pCi/L | 3 |
| Tuscola | 22.3 mi | 17.00 pCi/L | 1 |
| Paris | 26.9 mi | 9.67 pCi/L | 3 |
| Effingham | 32.6 mi | 4.33 pCi/L | 3 |
| Shelbyville | 33.6 mi | 17.00 pCi/L | 1 |
| Homer | 39.5 mi | 20.00 pCi/L | 1 |
| Urbana | 41.8 mi | 15.00 pCi/L | 1 |
| Monticello | 42.7 mi | 4.50 pCi/L | 2 |
Coles County Radon Profile
Because of its underlying geology, Coles 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 2 cities in Coles County average 9.00 pCi/L across 4 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 Coles County home regardless of zone or a neighbor's results.