Water Facts & Impacts

Native Wildlife

San Antonio River Basin

The San Antonio River Basin is a widespread system of rivers, creeks and stream channels that drain an area of state land over 4,000 squares miles in size. Major basin watersheds include the Medina River, Leon Creek, Upper/Lower San Antonio, Salado Creek and Cibolo Creek watersheds. The San Antonio River flows 240 miles from San Antonio/Bexar County into the Guadalupe River in Refugio County, from where it eventually drains into the San Antonio Bay and Gulf of Mexico.

Learn more about the size and range of our system of rivers, creeks and waterways as part of the San Antonio River Basin by visiting the following San Antonio River Authority webpage:

Understanding the San Antonio River Basin (SARA)

San Antonio River

The river/creek waters and neighboring riparian areas along their channels are also home and source of nourishment to a variety of local animals, fish, and other wildlife species, including:

  • Native fish: Largemouth Bass, Flathead Catfish, Longear Sunfish, Channel Catfish, Red Shiner
  • Native reptiles/amphibians: Comal Blind Salamander, Bullfrog, Rio Grande Leopard Frog, Diamondback Water Snake, Blotched Water Snake, Common Snapping Turtle, Red-Eared Slider, Texas River Cooter
  • Native mammals: Common Raccoon, White-Tail Deer, Nine-Banded Armadillo, Easter Cottontail Rabbit, Collared Peccary, Opossum
  • Native birds: Double-Crested Cormorant, Whooping Crane, Mallard, Osprey, Snowy Egret, Belted Kingfisher
  • Native plant species: American Water-Willow, American White Waterlily, Floating Primerose-Willow, Herb of grace, Manyflower Marshpennywort, Yellow Pond-Lily

Discover more facts and history about the San Antonio River’s source, length, development and diverse native wildlife species which are found along the river by visiting the following San Antonio River Authority webpages:


Storm Water Runoff

When polluted storm water runoff enters our rivers and creeks through our drainage system, chemical pollutants, hazardous bacteria and other wastes can affect the oxygen levels and nutrient balances needed by native fish, plants, animals and humans for survival:

  • Fish and plants inhabiting the rivers and creeks can suffocate, mutate and die off as pollutants infiltrate the water.
  • Animals who rely on the water as a natural drinking source can suffer poisoning, disease and decreased numbers.
  • River and creek water can become impaired over time, gradually making the rivers and creeks unsafe for swimming, fishing and other recreational activities.

Polluted runoff also poses risks to our very own drinking water. Water from our rivers and creeks flows into natural recharge zones which feed into our Edwards Aquifer. Left unchecked, runoff pollutants can infiltrate these recharge zones and threaten the water we rely on daily. While systems and controls are in place to help mitigate this risk, runoff water quality continues to be an important issue and priority in the overall health of our drinking water.

Want to know what’s in your drinking water? Visit the following San Antonio Water System webpages for water quality reports and information:

About Remember the River

Remember the River is a community campaign focused on nonpoint source pollution prevention outreach and education. The campaign is led by the City of San Antonio.

All campaign education and outreach efforts are conducted in compliance with educational/outreach guidelines established under a TPDES Phase I Municipal Separate Storm Sewer System (MS4) discharge permit regulated by the Texas Commission on Environmental Quality.

Contact Us

Darlene Dorsey 210.207.1011

Email Address:
Email Us

Mailing Address:
P.O. Box 839966
San Antonio, TX 78283-3966