Rio Escondido Wastewater Treatment Plant, Durango, Mexico

The Rio Escondido wastewater treatment plant is located in the municipality of Durango, in the state of Durango, Mexico. It serves a small population of 730 residents, providing secondary treatment to municipal wastewater. The plant is part of Mexico's national wastewater infrastructure, which is regulated under the Ley de Aguas Nacionales and NOM-001-SEMARNAT standards for discharge quality. The plant has a designed capacity of 172.80 cubic meters per day and currently treats an average daily flow of 69.12 cubic meters, indicating it operates below its full capacity. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids, meeting basic discharge standards for inland waters. The treated effluent is discharged into local water bodies that eventually drain into the Pacific Ocean via the Rio San Pedro and Rio Mezquital systems. The surrounding region is semi-arid, and the plant plays a key role in protecting local water quality and supporting downstream ecosystems.

The plant discharges into the Rio San Pedro basin, which flows into the Rio Mezquital and ultimately reaches the Pacific Ocean near the Marismas Nacionales region. This watershed supports diverse aquatic life and is important for migratory birds. The semi-arid climate makes water quality management critical for maintaining ecological balance and agricultural uses downstream.