Dos Rios WWTP - San Antonio, Texas Wastewater Treatment Plant

Dos Rios WWTP is a major wastewater treatment facility located in San Antonio, Texas, serving a population of approximately 1.13 million. As one of the largest plants in the region, it plays a critical role in managing municipal wastewater for the city and surrounding Bexar County. Under the U. S. Clean Water Act, large plants like Dos Rios are required to meet National Pollutant Discharge Elimination System (NPDES) permit standards. For a facility of this scale, secondary treatment is the minimum requirement, with advanced treatment often needed to protect sensitive water bodies. The plant's treatment processes are designed to comply with state and federal regulations. The treated effluent from Dos Rios WWTP is discharged into the San Antonio River, which flows southeast to join the Guadalupe River and ultimately empties into the Gulf of Mexico. This river system supports diverse aquatic life and provides water for recreation and agriculture downstream.

The plant discharges into the San Antonio River, a key tributary of the Guadalupe River basin. This river system flows through central Texas to the Gulf of Mexico, supporting a variety of fish and bird species. The watershed is ecologically sensitive due to its role in maintaining water quality for downstream communities and habitats.