Radon in Marshall County
High radon riskOver 2014-2023, 46.6% of Marshall County homes tested came back at or above the 4 pCi/L action level, above the statewide figure of 35.9%. The median test result here was 3.9 pCi/L over 2010–2020 (statewide median: 3.1 pCi/L). About 18 Marshall County properties were tested per year over that period. Roughly 50% of homes tested in this county came back at or above the 4 pCi/L action level.
| Tests at or above 2 pCi/L (2014-2023) | 68.8% (121 properties) |
| Tests at or above 4 pCi/L (2014-2023) | 46.6% (82 properties) |
| Median result (2010–2020) | 3.9 pCi/L |
| Average result (2010–2020) | 6.3 pCi/L |
| 95th percentile (2010–2020) | 18.6 pCi/L |
| Testing rate (2010–2020) | 37.3 per 10,000 properties per year |
Source: Minnesota Department of Health radon test data, last checked July 8, 2026. County numbers describe homes that happened to be tested, not yours; only a test can tell you your home's level.
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