any way to tell for certain it is a water snake?
I have my doubts on that one because it wasnt found all that close to water and this snake is very 'tame'. Every water snake Ive seen was very aggressive and every webpage about northern watersnakes stresses that too. They also say watersnakes are stoutly built. This little guy would have no problem crawling through a McDonalds drinking straw
One things that leads me to believe that it may very well be a watersnake is the way he moves on land. It resembles the movement of a sidewinder or sometimes in an inchworm fashion