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Unlike Wisconsin, Minnesota has been systematically testing its surface waters for endocrine disruptors and other chemicals of emerging concern. Lake Monona, Madison, in November 2012. Photo: Kate Golden, Wisconsin Center for Investigative Journalism

Unlike Wisconsin, Minnesota has been systematically testing its surface waters for endocrine disruptors and other chemicals of emerging concern. Lake Monona, Madison, in November 2012. Photo: Kate Golden, Wisconsin Center for Investigative Journalism

Unlike Wisconsin, Minnesota has been systematically testing its surface waters for endocrine disruptors and other chemicals of emerging concern. Lake Monona, Madison, in November 2012. Kate Golden/Wisconsin Center for Investigative Journalism