Jusme wrote:Kinda hard to tell from the picture, but it looks like the outer part of his mouth is yellow which would be a common water snake. I think the head shape looks triangular but may be that he has puffed his neck out slightly to give the appearance of a venomous snake. They will strike at you if cornered but they are not dangerous. JMHO based on the picture.
Looking at the head my first thought was also it's non-venomous banded water snake. They look very much alike both species have tremendous color variations. Belly scales and pupils are the telltale way to decide which it is.