Villa Union Wastewater Treatment Plant, Villa Unión, Durango, Mexico

Villa Union is a municipal wastewater treatment plant located in Villa Unión, within the municipality of Poanas, Durango, Mexico. The facility serves a population of approximately 7,391 residents, reflecting its role in managing domestic wastewater for this small agglomeration in northern Mexico. The plant operates with secondary treatment, which is the standard biological treatment level required under Mexican regulations (NOM-001-SEMARNAT) for municipal wastewater. It has a designed capacity of 959.04 m³/day and currently discharges 864 m³/day of treated effluent, indicating a utilization rate near 90%. The treated wastewater is discharged into the local environment, contributing to the protection of water resources in the region. The plant's operation helps safeguard downstream water bodies, including the San Juan River basin, which ultimately drains into the Pacific Ocean via the Presa El Palmito reservoir and the Nazas River system.

The plant discharges into the San Juan River basin, part of the larger Nazas River system that flows through Durango and into the Presa El Palmito reservoir. This watershed supports agricultural irrigation and local ecosystems in a semi-arid climate. The treated effluent helps maintain water quality for downstream communities and ecological functions, including habitat for native fish species.