Alhuey Wastewater Treatment Plant, Angostura, Sinaloa, Mexico

Alhuey wastewater treatment plant is located in the town of Alhuey, within the municipality of Angostura, Sinaloa, Mexico. The facility serves a population of approximately 4,290 residents, classifying it as a small-scale municipal treatment plant in a rural agricultural region. The plant provides secondary treatment, which is the standard biological treatment process for removing organic matter and suspended solids. With a designed capacity of 457.92 thousand m³/year and an actual discharge volume of 406.08 thousand m³/year, the plant operates at about 89% capacity. Mexican wastewater treatment plants are regulated under NOM-001-SEMARNAT-1996, which sets discharge limits for pollutants into national waters. The treated effluent from Alhuey flows into local streams and canals that drain into the Pacific Ocean via the coastal lagoons and estuaries of Sinaloa. The region's water bodies support diverse aquatic life and are important for local fisheries and agriculture. Proper treatment helps protect downstream ecosystems and public health.

The plant discharges into the Sinaloa river basin, which ultimately drains into the Pacific Ocean through the Gulf of California. The coastal lagoons and estuaries in this region provide critical habitat for migratory birds, fish, and shrimp. Secondary treatment reduces organic pollution, helping to maintain water quality in these ecologically sensitive coastal waters.