Millions in Michigan exposed to potentially unsafe chemicals in water

Nearly 6 million Michigan residents drink, cook with and otherwise use tap water with an unregulated heavy metal, hexavalent chromium, at levels above where scientific study shows a cancer risk exists, a database compiled by an environmental nonprofit organization shows....
http://www.freep.com/story/news/2017/07/26/millions-michigan-exposed-potentially-unsafe-chemicals-water/509172001/