Amarillas de Esparza Wastewater Treatment Plant, Asientos, Aguascalientes

Amarillas de Esparza is a wastewater treatment plant located in Asientos, Aguascalientes, Mexico. It serves a small community of 1,369 people, providing secondary treatment to municipal wastewater. The plant is situated in the semi-arid highlands of central Mexico, an area where water resources are scarce and treatment is critical for local reuse and environmental protection. The plant operates with secondary treatment, which is the standard biological process for removing organic matter and suspended solids. With a designed capacity of 190.08 cubic meters per day and an actual discharge volume of 129.60 cubic meters per day, it operates below its full capacity. Under Mexican regulations (NOM-001-SEMARNAT-1996 and subsequent updates), secondary treatment is required for discharges into national waters, ensuring compliance with national water quality standards. 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. This region supports agricultural activities and small-scale ecosystems, making the plant's role in preventing untreated sewage discharge vital for protecting downstream water quality and public health.

The plant discharges into local arroyos that feed into the Rio Grande de Santiago basin, which flows through Aguascalientes and Jalisco before reaching the Pacific Ocean. The semi-arid climate means water bodies in this region are particularly sensitive to pollution, as low flows reduce dilution capacity. The plant helps protect downstream agricultural irrigation and small aquatic habitats from untreated wastewater.