Marshall, MI Radon Levels
Check local Marshall radon levels and find certified testing and mitigation professionals to keep your home safe
Marshall, MI Radon Facts
Centered in Calhoun County in south-central Michigan, Marshall shows an average radon level of 8.5 pCi/L, which significantly exceeds the EPA action threshold. The city's glacial till deposits over limestone bedrock create favorable conditions for radon gas production and accumulation in homes. Residents should prioritize testing and mitigation, as readings have ranged from 4.0 to 13.0 pCi/L in recent tests.
Based on 2 user-submitted radon tests for homes in Marshall, MI. The EPA recommends taking action at or above 4.0 pCi/L.
Marshall, MI Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Marshall, MI Radon Levels
User-submitted radon test readings from homes in the Marshall area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 13 pCi/L | Marshall, MI | 51-99 Years | Full Basement |
| 4 pCi/L | Marshall, MI | 21-50 Years | Full Basement |
Have a radon test result for Marshall? Submit your reading to help other homeowners.
Radon Readings Near Marshall, MI
Compare radon levels in Marshall with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Ceresco | 8.9 mi | 3.00 pCi/L | 1 |
| Battle Creek | 12.0 mi | 6.60 pCi/L | 5 |
| Concord | 16.7 mi | 5.00 pCi/L | 1 |
| Spring Arbor | 21.4 mi | 20.00 pCi/L | 1 |
| Charlotte | 21.5 mi | 12.00 pCi/L | 2 |
| Coldwater | 24.1 mi | 9.00 pCi/L | 1 |
| Rives Junction | 26.8 mi | 5.00 pCi/L | 1 |
| Jackson | 28.4 mi | 7.00 pCi/L | 1 |
Calhoun County Radon Profile
Because of its underlying geology, Calhoun 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 3 cities in Calhoun County average 6.63 pCi/L across 8 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 Calhoun County home regardless of zone or a neighbor's results.