A new government study has revealed that nearly half of the United States' tap water contains one or more "forever chemicals" known as PFAS, which have been linked to a range of health problems. The study is the first nationwide effort to test for PFAS in tap water from private sources, and is a reminder of the importance of being aware of the water sources in your area. The EPA has established a health advisory level for two types of PFAS, but individuals should take steps to protect their health, such as using a water filter or drinking bottled water.