The Trump administration has quietly released a major review of a national water contamination crisis caused by a family of chemicals known as PFASs, after President Trump’s Environmental Protection Agency suppressed publication of the federal health study. Internal emails, released after a Freedom of Information Act request, showed a Trump administration aide seeking to suppress the study, and warning a top EPA official about the “potential public relations nightmare this is going to be.” The U.S. Department of Health and Human Services study found the chemicals PFOA and PFOS, which are used in Teflon and firefighting foam, are unsafe for human health at levels as little as one-tenth the amount the EPA had previously called safe. The Pentagon has used foams containing these chemicals in exercises at military bases nationwide. In a March report to Congress, the Pentagon listed 126 military installations where the nearby water shows potentially harmful levels of these chemicals, which have been linked to cancers and developmental delays for fetuses and babies.