San Luis de Letras Wastewater Treatment Plant, Aguascalientes, Mexico

San Luis de Letras is a municipal wastewater treatment plant located in the town of San Luis de Letras, within the municipality of Pabellón de Arteaga, Aguascalientes, Mexico. The plant serves a population of 2,647, classifying it as a small-scale facility under Mexican wastewater management frameworks. The plant provides secondary treatment, which is the standard level required for municipal wastewater in Mexico under NOM-001-SEMARNAT-1996. With a designed capacity of 198.72 m³/day and a discharge volume of 250.56 m³/day, the plant operates at a utilization rate exceeding its design capacity, indicating potential stress on the system. The facility is regulated by Mexican environmental authorities, ensuring compliance with discharge standards for organic matter and suspended solids. The treated effluent is discharged into local water bodies that ultimately drain into the Rio Grande de Santiago basin, which flows westward to the Pacific Ocean. The plant plays a crucial role in protecting downstream aquatic ecosystems and water quality in the region's semi-arid landscape, where water resources are particularly valuable.

The plant's discharge enters the local drainage network within the Rio Grande de Santiago basin, which flows through central Mexico before reaching the Pacific Ocean. This watershed supports agricultural activities and provides habitat for diverse aquatic species. The semi-arid climate of Aguascalientes makes water quality management critical for maintaining ecological balance and supporting downstream communities that rely on these water resources.