Vallecillo Wastewater Treatment Plant, Nuevo León, Mexico

Vallecillo wastewater treatment plant is located in the town of Vallecillo, Nuevo León, Mexico. It serves a small population of 671 people, reflecting its role in a rural or semi-urban community. The plant provides secondary treatment, which is a standard biological process that removes organic matter and suspended solids. With a designed capacity of 432.00 cubic meters per day and an actual discharge volume of 86.40 cubic meters per day, the plant operates well below its capacity. In Mexico, wastewater treatment plants are regulated under the Federal Water Rights Law (Ley de Aguas Nacionales) and NOM-001-SEMARNAT-1996, which sets discharge limits for pollutants. For small communities, secondary treatment is typically sufficient to meet these standards. The treated effluent is likely discharged to a local watercourse, contributing to the hydrology of the region. Nuevo León is a semi-arid state, and water resources are critical for both human use and ecosystem health. The plant's operation helps protect downstream water quality in the Rio Grande basin, which ultimately drains into the Gulf of Mexico.

The plant discharges into a local watercourse that is part of the Rio Grande basin, which flows through northeastern Mexico and Texas before reaching the Gulf of Mexico. This region supports diverse aquatic life and is important for migratory birds. Proper wastewater treatment is essential to prevent nutrient pollution and maintain water quality in this semi-arid environment.