How often should I test my home for radon?

According to the MN Department of Health, all Minnesota homes should be tested for radon and then retested every 2-5 years (and homeowners should save their test results). Additionally, homes should be tested after making changes to the foundation, heating, cooling or ventilation system. If your living patterns change and you begin occupying a lower level of your home (such as a basement) you should retest your home on that level. Also consider testing before a major remodeling project to determine if radon mitigation should be added into the project and then retest after adding a radon mitigation system to make sure it is working properly.