Our rivers have come a long way, one stretch of the Monongahela went from a single fish fifty years ago to more than 23,000 today. Cleaner water doesn't automatically mean swimmable water. In a new piece for The Conversation, GES Associate Professor, Dr. Dan Bain, breaks down what sewage overflows, industrial legacy, and a tenth of an inch of rain mean for anyone thinking about taking a dip. Read more at The Conversation.