No one seems to want to admit when American water isn’t safe to drink. Instead, they try to hide it. For years, U.S. health officials have claimed that although the drinking water at North Carolina’s Camp Lejeune is contaminated, it poses no danger to Marines or their families. This April, the government reversed itself, saying that its assessment of the water contained “omissions” and “inaccuracies,” and adding that a million people over the course of three decades may have been exposed to the carcinogen benzene in their water. Fifteen hundred former Lejeune Marines, some of whom are now afflicted with rare lymphomas, have filed lawsuits seeking more than $33 billion. Sadly, Lejeune is just one of the many recent poisoned-water cover-ups in American history. There are others going on all the time. Here are some more of the worst.