Doctor Castillo del Valle Wastewater Treatment Plant - Durango, Mexico

Doctor Castillo del Valle is a wastewater treatment plant located in the town of Doctor Castillo de Valle, within the municipality of Nuevo Ideal, Durango, Mexico. The plant serves a population of approximately 1,149 people, making it a small-scale facility focused on local sanitation needs. The plant operates with secondary treatment, which is the standard level required under Mexican regulations (NOM-001-SEMARNAT-1996) for municipal wastewater before discharge into water bodies. The facility has a designed capacity of 138.24 m³/day and currently processes 112.32 m³/day, indicating it is operating below its full capacity. The treated effluent is discharged into a local watercourse that eventually drains into the Nazas River basin, part of the larger hydrological system in northern Mexico. This region is semi-arid, so the plant plays a crucial role in protecting local water quality and supporting downstream ecosystems, including agricultural areas that rely on the river for irrigation.

The plant discharges into a tributary of the Nazas River, which flows through the arid landscape of Durango and eventually reaches the Laguna de Mayran, an important wetland in the region. This water body supports diverse aquatic life and provides critical habitat for migratory birds. The plant's secondary treatment helps reduce organic pollutants and suspended solids, protecting the ecological health of the downstream watershed.