Boquilla de Abajo Wastewater Treatment Plant, Zacatecas, Mexico

Boquilla de Abajo is a wastewater treatment plant located in the municipality of Cañitas de Felipe Pescador, Zacatecas, Mexico. It serves a small community of 1,369 people, reflecting its role in rural wastewater management in the semi-arid region of north-central Mexico. The plant provides secondary treatment, a standard level for small agglomerations under Mexican regulations (NOM-001-SEMARNAT-1996). Its designed capacity is 259.20 cubic meters per day, with an actual discharge volume of 129.60 cubic meters per day, indicating moderate utilization. The plant operates under Mexico's federal water quality standards, which set discharge limits for pollutants into national waters. The treated effluent is discharged into local water bodies that eventually drain into the Rio Grande basin, part of the larger Gulf of Mexico watershed. The surrounding region is characterized by drylands and seasonal streams, making water quality management critical for local ecosystems and downstream agricultural use.

The plant discharges into local arroyos that feed into the Rio Aguanaval, a tributary of the Rio Grande (Rio Bravo). This basin ultimately drains into the Gulf of Mexico, supporting diverse aquatic life and irrigation-dependent agriculture. The semi-arid climate means that even small effluent volumes can significantly affect stream flow and water quality, particularly during dry seasons.