Radon Map: MNPH Data Access - MN Dept. of Health

Radon is a colorless, odorless radioactive gas that naturally comes from the soil. It can enter any building—homes, offices, and schools—and result in a high indoor radon level. Radon gives off radioactive particles that, when breathed in, can damage the lining of the lungs. The U.S. Surgeon General has warned that radon is the second leading cause of lung cancer in the United States today. Radon accounts for about 21,000 lung cancer deaths every year and is a serious public health issue in Minnesota, where 2 in 5 of tested homes have radon levels that are a major health risk.

For more information, visit MN Public Health Data Access: Radon.

Data Notes

Threshold of ≥ 2 pCi/L was selected because the EPA recommends considering mitigation if a home tests at ≥ 2 pCi/L. Threshold of ≥ 4 pCi/L was selected because the EPA highly encourages mitigation if a home tests at ≥ 4 pCi/L.
Even if your county has a lower average radon level, it is important to test your own home since radon levels can vary widely even between homes in the same neighborhood.
These data include commercial and residential radon tests, although the majority are likely from single family homes, the tests often do not indicate whether they are commercial or residential.
The testing assumes that users (primarily property owners) followed the instructions for test kit deployment.
These data are incomplete; some of the radon data was not reported from the laboratories.
These data exclude most tests conducted with continuous radon monitors by professionals, such as home inspectors, that are used in real estate transactions.
Counties with less than 20 radon tests tested should be interpreted with caution; the data may be unstable because it can change with the addition or subtraction of one test. Unstable data are displayed with hash-marks on the map and an asterisk (*) next to the county name on the pop-up display and table.
These data include Post Office (PO) Boxes, and it is possible the physical and mailing addresses may be in different geographies represented.
For additional information pertaining to the data, please visit the "About the Radon" page.

Data Sources

Minnesota Department of Health Indoor Air Unit Radon Test Data

For questions or more information regarding the mapping application, please contact the Minnesota Public Health Data Access
or via e-mail at: health.dataportal@state.mn.us

Region	Average Annual Number of Properties Tested	Average Annual Properties Tested per 10,000	Number of Properties Tested ≥ 2 pCi/L	Percent of Properties Tested ≥ 2 pCi/L	Number of Properties Tested ≥ 4 pCi/L	Percent of Properties Tested ≥ 4 pCi/L	95th Percentile Radon Value pCi/L (^)	Median Radon Value pCi/L	Average (Geometric) Radon Value pCi/L	Average (Arithmetic) Radon Value pCi/L

County	Average Annual Number of Properties Tested	Average Annual Properties Tested per 10,000	Number of Properties Tested ≥ 2 pCi/L	Percent of Properties Tested ≥ 2 pCi/L	Number of Properties Tested ≥ 4 pCi/L	Percent of Properties Tested ≥ 4 pCi/L	95th Percentile Radon Value pCi/L (^)	Median Radon Value pCi/L	Average (Geometric) Radon Value pCi/L	Average (Arithmetic) Radon Value pCi/L