El Tamarindo Wastewater Treatment Plant, Adolfo López Mateos, Sinaloa, Mexico

El Tamarindo is a wastewater treatment plant located in Adolfo López Mateos, a locality within the municipality of Culiacán, Sinaloa, Mexico. The plant serves a population of approximately 6,423 people, making it a small-scale municipal facility. It is situated inland, away from coastal areas, and operates within the state's water management infrastructure. The plant provides secondary treatment, which is the standard biological treatment level required under Mexican regulations (NOM-001-SEMARNAT-1996) for municipal wastewater before discharge. With a designed capacity of 1,365.12 m³/day and an actual discharge volume of 950.40 m³/day, the facility operates below its full capacity, indicating room for future growth or seasonal variations. The treated effluent from El Tamarindo is discharged into local water bodies that ultimately drain into the Pacific Ocean via the Sinaloa River basin. The plant plays a key role in protecting downstream ecosystems, including agricultural areas and coastal lagoons, by reducing organic pollutants and pathogens before release.

The plant discharges into the Sinaloa River basin, which flows westward through the state of Sinaloa and empties into the Gulf of California (Sea of Cortez). This region supports diverse aquatic life, including commercially important fish and shrimp species. The downstream environment includes wetlands and estuaries that serve as critical habitats for migratory birds. Proper wastewater treatment is essential to prevent eutrophication and maintain water quality for both ecological and agricultural uses.