I just passed along the picture and what I was told they were. But, from the water moccasins I have seen they certainly look like they are. We have plenty of them here in Texas so it wouldn't surprise me.
Ed Greding wrote:
Are you certain they are Water Moccasins (=Cottonmouths) or Ancistrodon piscivorous scientifically, sometimes placed in genus Agkistrodon (older name). I can't tell for sure from the photo, but look between the nostril and the eye for a pit; if one is present, the snake is poisonous for sure. Of course, looking for the pit can involve getting a bit close....But then, some, probably most, could be harmless water snakes. Those do bite, but aren't poisonous.