by Keith Matheny, Detroit Free Press
Researchers have found that pharmaceuticals and personal-care byproducts persist at low levels miles from sewage discharge pipes in Lake Michigan. And a study from the University of Wisconsin-Milwaukee shows that the most prevalent drug in the lake — the Type 2 diabetes medication Metformin — changes the hormonal system of fish exposed to it.
http://www.freep.com/story/news/local/michigan/2015/01/13/metformin-diabetes-drug-pollution-lake-michigan/21734507/