Surface Water Treatment Plant

Operated by GBRA

91 Old Bastrop Highway

512.353.3888

The Surface Water Treatment Plant is owned by the City of San Marcos and operated and maintained by the Guadalupe-Blanco River Authority (GBRA).

The City obtains raw surface water from the Guadalupe River via a pipeline operated by GBRA.  The source of the surface water for the City is considered to be Canyon Lake.  The City currently obtains approximately 75% of its potable water from the SWTP and augments the remaining 25% from groundwater sources located at five separate wells.   In 2008, the City treated 2,374 million gallons of surface water.