Cerro de Abajo Wastewater Treatment Plant, Cerro Angostura, Sinaloa

Cerro de Abajo is a municipal wastewater treatment plant located in Campo San Miguel, Cerro Angostura, within the municipality of Angostura, Sinaloa, Mexico. The plant serves a small population of 183 residents, reflecting its role in a rural or small community setting. The plant provides secondary treatment, which is the standard biological treatment level required under Mexican regulations (NOM-001-SEMARNAT-1996) for municipal wastewater. With a designed capacity of 25.92 m³/day and an actual discharge volume of 17.28 m³/day, the plant operates below its design capacity, indicating adequate headroom for current demand. The treated effluent is discharged into the local environment, contributing to the protection of downstream water bodies. The plant's location in Sinaloa, a state along the Pacific coast, means its discharge ultimately drains into the Gulf of California, supporting regional water quality and aquatic ecosystems.

The plant's discharge enters the local drainage network within the Sinaloa watershed, which flows into the Gulf of California. This coastal region supports diverse marine life, including important fisheries and migratory species. Proper treatment helps prevent nutrient loading and pathogen contamination that could affect downstream estuaries and coastal habitats.