Possible (pet?) cayuga duck in our lake? Not bird expert tho. (More info below)

From what I've seen this bird totally looks like a cayuga duck. When the sun hits it just right, little guy's head shimmers a tiny bit green. But also from what I've read, these ducks aren't found naturally in Ohio, so I'm think maybe it's someone's escaped pet or farm animal? I'm in Reynoldsburg, right next to Columbus, not quite in it. Has anyone lost a very cool duck?