Siqueros Wastewater Treatment Plant, Sinaloa, Mexico

Siqueros wastewater treatment plant is located in the town of Siqueros, within the municipality of Mazatlán, Sinaloa, Mexico. The plant serves a small population of approximately 1,967 residents, reflecting its role in a rural or peri-urban community. It operates under Mexico's national water regulations, which mandate treatment standards for municipal wastewater. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 216.00 cubic meters per day and an actual discharge volume of 198.72 cubic meters per day, the facility operates at high utilization. The treatment process aligns with Mexican norms (NOM-001-SEMARNAT) for discharge quality. The treated effluent is discharged into local water bodies that ultimately drain into the Pacific Ocean via the region's coastal watershed. The plant's location inland, more than 50 km from the coast, reduces direct marine impact. The surrounding area supports agricultural and natural ecosystems, making proper treatment essential for protecting downstream water quality.

The plant discharges into local streams that flow toward the Pacific coast of Sinaloa, contributing to the region's hydrological network. The downstream environment includes estuaries and coastal lagoons that support diverse aquatic life, including fish and migratory birds. Effective secondary treatment helps prevent nutrient loading and organic pollution that could harm these sensitive habitats.