21, 2012 file photo shows Saginaw City Manager Darnell Earley at a news conference in Saginaw, Mich. Earley, the state-appointed emergency manager for Detroit's troubled school district, is leavin... Michigan's top environmental regulator says the state should have required the city of Flint to treat its water for corrosion after elevated lead levels were first discovered in the city's water a year ago.