To find the difference between a poisonous water moccasin / cottonmouth and a harmless water snake:

Snakes are not aggressive creatures, they do not chase people. jurgen teller Some snakes are poisonous, but is only dangerous for certain types of animals. So, just because a venomous snake has bitten you does not mean death. It does not matter if the snake is large or small. The strength of the poison is not dependent on how big the snake is. A small snake, depending on the type and mood, and other factors may be more dangerous than a large one.
Inland Taipan snake is snake with the deadliest poison known to man. Just because you have cut out of the serpent's head does not mean that the danger from the poison has passed away. The strength of a snake's venom does not disappear even after the worm is dead. So if you've killed a snake and poison is still flowing, be careful. The dead snake also still dangerous. Always assume that the snake is venomous until you are absolutely sure it is not.
Stable, non-toxic, have a round pupil in the center of the eye. All poisonous snakes have a vertical elliptical feline shaped pupil. Poisonous snake will have a slight depression between the eye and the nose. This is called a pit used to sense heat in their prey. If the snake has stripes from head to tail chances are it is a non-poisonous snake.
To find the difference between a poisonous water moccasin / cottonmouth and a harmless water snake: Is swimming with mainly head above water, or most of the body fluid as well? If only the head shows, it is probably a harmless water snake, but if the body also, there may be a water moccasin.
The two large venomous snake families are Vipers and elapsids. The Viper family, among them Copperheads and rattlesnakes are the typical hoses with triangle shaped head. Elapsids is the exception and not the triangle shaped head. Elapsids include dead worms, Cobra, Mamba, sea snakes, and coral snake. They possess hollow fixed fangs, unlike vipers whose folding fangs. In North America, the only elapsid that can occur is the coral snake, which is easy to identify because of the colorful bands.
Rattlesnakes will usually issue a warning rattle (a dry, whirring sound) when approached. But more nonpoisonous snakes like black racers, corn snakes, rat snakes, milk snakes, and pine snakes and several poisonous snakes copperhead and cottonmouth often vibrate their tails when provoked. The sound produced by this vibration often resembles a rattle or popping sound when the snake is sitting in dry grass or leaves. Non-poisonous jurgen teller snakes generally have only one color.
Scale scheme is another way of identification. Bottom shells of a poisonous snake tail go completely all the way into a single row from the anal plate. The very tip of the tail may have two scale rows. Non-poisonous snakes have two rows of shells from the valve to the end of the tail.
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