Western aquatic garter snake
- kingdom: Animalia
- phylum: Chordata
- class: Reptilia
- order: Squamata
- family: Natricidae
- genus: Thamnophis
- species: Thamnophis couchii
El Sauzal- Primo Tapia
Baja California
Mexico
Agoura- Agoura Hills
- Anderson
- Bodfish
- Chester
- Crestline
- Deer Park
- Diablo
- East Richmond Heights
- El Cerrito
- Escondido
- Frazier Park
- Fresno
- Kensington
- Kings Beach
- Lake Isabella
- Lone Pine
- Loomis
- Malibu Beach
- Moraga
- Murphys
- Palos Verdes Estates
- Perris
- Pollock Pines
- Red Bluff
- Rolling Hills Estates
- Saranap
- Tehachapi
- Topanga
- Trabuco Canyon
- Visalia
- Weldon
- West Bishop
- Yosemite Valley
California- Carson City
- Mogul
- Verdi
Nevada
United States