Banded Water Snake

The banded water snake, also known as the southern water snake, is a primarily aquatic colubrid native to the midwestern and southeastern US. It is of medium size and has a fairly heavy body. The snakes get darker with age, and the adults get killed due to their resemblance to the venomous cottonmouths.

Scientific Classifications

  • Suborder:Serpentes
  • Family:Colubridae
  • Genus:Nerodia
  • Species:N. fasciata

Conservation Status

Not EvaluatedNE

Not Evaluated

Data DeficientDD

Data Deficient

Least ConcernLC

Least Concern

Near ThreatenedNT

Near Threatened





Critically EndangeredCR

Critically Endangered

Extinct in the wildEW

Extinct in the wild




This snake has three recognized subspecies.

  • Broad-banded water snake (Nerodia fasciata confluens)
  • Florida banded water snake (Nerodia fasciata pictiventris)
  • Southern water snake (Nerodia fasciata fasciata)



The adult southern water snake measures 24-42 inches (61-107 cm) in length. Its average body mass is 16.38 oz (464.3 g)

Banded Water Snake Belly

Color and Appearance

The colubrid is typically greenish-gray, gray, or brown with a dark crossband pattern. Some individuals are so dark in color that their markings can be barely seen. The belly is usually off-white to white. Another identifying trait is a dark stripe stretching from the eye to the angle of the jaw. It has a flat head and exhibits sexual dimorphism, with the female being longer and heavier than the male.

Are They Dangerous to Humans 

These snakes are quick to flee if they sense danger. But if cornered or captured, they can act pretty defensive and don’t hesitate to inflict a painful non-venomous bite. When irritated, they release a foul-smelling musk to resist their attacker.

Banded Water Snakes at a Glance


The species can be found in Indiana, to the south of Louisiana, and east of Florida. A big population also inhabits the Colorado river basin near Yuma, Arizona.

Banded Water Snake Range Map


It thrives in freshwater environments of lakes, ponds, marshes, and streams.

Active during both day and night, the snake can be mostly found lounging on logs or branches hanging over water or hunting in shallow water.

Banded Water Snake Image


The southern water snake lives for about 8 years in the wild and 3 years in captivity.


Its main enemies are birds of prey such as the great blue heron, semi-aquatic creatures such as the alligator, and other bigger snakes.


It eats a variety of prey like frogs, fish, salamanders, and tadpoles that they forage using their senses of smell and sight. It catches and swallows them whole without constricting or subduing them. Juveniles mainly eat fish as eating other kinds of prey like frogs is challenging for them as their jaws don’t open much wide.

Nerodia fasciata


Viviparous (gives birth to live young)

Baby Banded Water Snake

The babies are born in late July or August, with the brood size varying between 15 and 20. They are 8-9.5 inches (20-24 cm) in length. The species can mate with the common watersnake on rare occasions, but there are not enough traits to identify the hybrids. DNA analysis is required to prove the union.

Juvenile Banded Water Snake

Similar Species

Cottonmouth or Water Moccasin

The venomous cottonmouth or water moccasin, Agkistrodon piscivorus, has a big, blocky head that is distinctly wider than its neck. The banded water snake has an elongated, slender head that smoothly blends into the body with no prominent neck.


The venomous copperhead, Agkistrodon contortrix, has a triangular head, while the southern water snake has a narrower, straight, and slightly rounded head that is in line with its body. Plus, the bands on the latter are broadest on top and have a symmetrical appearance, while those on the copperhead are narrowest on top with the pattern resembling an hourglass.

Care Sheet

Size of the Enclosure: The length of the vivarium should not exceed 2/3rd of the size of the adult snake. So an enclosure of a minimum of 18 inches (45 cm) length can be used for housing a male, and the same should be 24-30 inches (61-76.2 cm) for a female.

Southern Water Snake

Temperature: The hot end temperature of the enclosure can reach up to 86°F, and the cold end should be maintained at 75.2°F.

Humidity: The ideal humidity for the pet setup is 60%, and it should not fall below 40%. A larger than average-sized water bowl should be placed in the middle of the tank.

Substrate: Coir, orchid bark, or a mixture of both is a suitable substrate. It should never be water-logged.

Feeding: Adults can be fed defrosted mice while hatchlings and very young snakes can be given pinkies.


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