Alfonso G Calderon Velarde Wastewater Treatment Plant, Sinaloa, Mexico

The Alfonso G Calderon Velarde wastewater treatment plant is located in the town of Alfonso G. Calderón Velarde, within the municipality of Sinaloa, Sinaloa, Mexico. The plant serves a population of 3,560 residents, classifying it as a small-scale municipal facility. The plant provides secondary treatment, which is a standard biological process that removes biodegradable organic matter and suspended solids. With a designed capacity of 336.96 volume units and a discharge volume matching that figure, the facility operates at full capacity. As a Mexican plant, it falls under the national water quality regulations (NOM-001-SEMARNAT-1996) that set discharge limits for pollutants. The treated effluent is discharged into the local watershed, which ultimately drains into the Pacific Ocean via the Sinaloa River system. The plant plays a key role in protecting downstream water bodies from untreated sewage, supporting both local communities and aquatic ecosystems in the region.

The plant discharges into the Sinaloa River basin, which flows through the state of Sinaloa and empties into the Gulf of California (Pacific Ocean). This watershed supports diverse aquatic life and is important for local fisheries and agriculture. The secondary treatment provided helps reduce organic pollution and nutrient loading, mitigating eutrophication risks in downstream coastal waters.