Milpillas de Allende Wastewater Treatment Plant, Zacatecas, Mexico

Milpillas de Allende wastewater treatment plant is located in the town of Milpillas de Allende, within the municipality of Teúl de González Ortega, Zacatecas, Mexico. The plant serves a small population of 688 residents, reflecting its role in a rural community. It is situated inland, more than 10 km from the coast, and operates as part of the local municipal wastewater infrastructure. The plant provides secondary treatment, which is the standard biological treatment process for removing organic matter and suspended solids. With a designed capacity of 138.24 m³/day and a discharge volume matching that figure, the facility operates at full capacity. Under Mexican regulations (NOM-001-SEMARNAT-1996 and subsequent updates), secondary treatment is required for discharges into national waters, ensuring compliance with environmental standards. The treated effluent is discharged into local water bodies that ultimately drain into the Pacific Ocean via the Río Grande de Santiago basin. The plant's operation helps protect downstream aquatic ecosystems and supports water quality in the region, which is characterized by semi-arid climate and agricultural land use. Proper wastewater management is critical for preserving local water resources and public health.

The plant discharges into the local watershed, which is part of the Río Grande de Santiago basin, flowing westward to the Pacific Ocean. This region supports diverse aquatic life and is important for irrigation and livestock. The semi-arid climate makes water quality management essential for maintaining ecological balance and preventing contamination of downstream water bodies.