Overview
San Marcos WWTP serves approximately 45,000 people in San Marcos, Texas. The plant operates under the U.S. Clean Water Act, with NPDES permits regulating its discharge to protect local water quality.
San Marcos WWTP is a municipal wastewater treatment facility located at 2514 Staples Road in San Marcos, Texas, serving a population of around 45,000. The plant is situated in Hays County, part of the growing Austin-San Antonio corridor, and plays a key role in managing the region's wastewater. As a U.S. facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Texas Commission on Environmental Quality (TCEQ). For a plant serving a medium-sized agglomeration, secondary treatment is typically required, with additional nutrient removal if discharging to sensitive waters. The plant's treated effluent is discharged into the San Marcos River, a spring-fed river that flows into the Guadalupe River and eventually to the Gulf of Mexico. The San Marcos River is ecologically significant, supporting diverse aquatic life including several threatened and endangered species, and is a popular recreation destination.
Environmental context
The San Marcos WWTP discharges into the San Marcos River, which originates from the San Marcos Springs and flows southeast to join the Guadalupe River. The Guadalupe River then empties into San Antonio Bay and the Gulf of Mexico. The river supports a unique ecosystem with high biodiversity, including the Texas blind salamander and fountain darters, and is a critical water source for downstream communities and habitats.
Frequently asked questions
San Marcos WWTP is located at 2514 Staples Road in San Marcos, Texas, United States, in Hays County.
The plant serves approximately 45,000 people in the San Marcos area.
The plant discharges treated effluent into the San Marcos River, which flows into the Guadalupe River and eventually to the Gulf of Mexico.
As a U.S. facility, San Marcos WWTP operates under the Clean Water Act and is regulated by an NPDES permit issued by the Texas Commission on Environmental Quality (TCEQ).
For a medium-sized agglomeration like San Marcos, secondary treatment is standard under the Clean Water Act, with possible additional nutrient removal if discharging to sensitive water bodies.
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