Allende II Wastewater Treatment Plant, Allende, Nuevo León, Mexico

Allende II is a municipal wastewater treatment plant located in the city of Allende, within the state of Nuevo León, Mexico. The plant serves a population of around 38,301 residents, placing it in the medium-sized agglomeration category for Mexican wastewater infrastructure. As a plant in Mexico, Allende II operates under the framework of the Ley de Aguas Nacionales (National Water Law) and is subject to standards such as NOM-001-SEMARNAT, which sets discharge limits for pollutants. The plant discharges treated wastewater into the local watershed, which ultimately drains into the Gulf of Mexico via the Rio Grande basin. This region supports diverse aquatic life and is important for both ecological balance and local water resources. Proper treatment helps protect downstream water quality and ecosystems.

The plant's treated effluent enters the local drainage network within the Rio Grande basin, flowing eastward toward the Gulf of Mexico. This watershed supports a variety of freshwater species and provides water for agricultural and municipal use. The Gulf of Mexico is a major marine ecosystem, and nutrient loading from inland sources can contribute to hypoxic zones, making effective treatment critical for downstream environmental health.