In 2018 the Pentagon released its first assessment of the levels of PFAS in its water systems. PFAS is a chemical compound that has been used in military and commercial airport fire-fighting foam for decades; it has been linked to cancers and birth defects. On Monday, Northeastern University and the Environmental Working Group combined this data with public water utility reports to provide the most comprehensive look to date at the extent of PFAS contamination, to include hundreds of communities across the U.S. Based on the research, more than 610 locations in 43 states, impacting 19 million people. The list below is just the military base data, which is searchable by state, military base, service and the extent of contamination.