El Porvenir Wastewater Treatment Plant, Zacatecas, Mexico

El Porvenir wastewater treatment plant is located in the town of El Porvenir, within the municipality of Trancoso, Zacatecas, Mexico. The facility serves a population of approximately 1,175 people, classifying it as a small-scale municipal treatment plant in the central highlands of Mexico. The plant provides secondary treatment, which is the standard biological treatment level required under Mexican regulations (NOM-001-SEMARNAT-1996) for municipal wastewater before discharge. With a designed capacity of 181.44 m³/day and an actual discharge volume of 129.60 m³/day, the plant operates below its design capacity, indicating adequate headroom for current flows. The treated effluent is discharged into the local watershed, which ultimately drains into the Rio Grande de Santiago basin, flowing westward toward the Pacific Ocean. The plant plays a key role in protecting local water quality in the semi-arid Zacatecas region, where water resources are scarce and pollution control is critical for both human use and ecosystem health.

The plant discharges into the Rio Grande de Santiago basin, which drains through the Lerma-Chapala-Santiago system into the Pacific Ocean. This watershed supports diverse aquatic life and provides water for agriculture and communities downstream. In the semi-arid Zacatecas region, maintaining water quality is essential for sustaining local ecosystems and preventing contamination of groundwater and surface water resources.