Water snake

Different snakes are called water snakes. Most are colubrids. Examples include:

Helicops species, including:
Helicops angulatus
Liophis species, including:
Liophis cobellus
Liophis reginae
Nerodia species, including:
Nerodia sipedon
Nerodia rhombifer - Diamond Back Water Snake
Enhydris species, including:
Enhydris enhydris
Enhydris sieboldi
Xenochrophis species, including:
Xenochrophis piscator - the Asiatic Water Snake or Chequered Keelback
Hydrodynastes species, including:
Hydrodynastes gigas - the False Water Snake or Brazilian Smooth Snake