Cerro Segundo Wastewater Treatment Plant, Sinaloa, Mexico

Cerro Segundo is a wastewater treatment plant located in the town of Cerro Segundo, within the municipality of Angostura, Sinaloa, Mexico. It serves a small population of 365 residents, reflecting its role in a rural or peri-urban setting. The plant is part of Mexico's national wastewater infrastructure, which is regulated under the Mexican Official Standards (NOMs) for water quality and discharge. The plant operates with secondary treatment, a standard level that removes organic matter and suspended solids. Its designed capacity is 129.60 volume units, while the current discharge volume is 34.56, indicating utilization well below capacity. This suggests the plant is sized for potential future growth or seasonal demand. The treated effluent is discharged into the local watershed, which ultimately drains into the Pacific Ocean via the Gulf of California. 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 in the coastal plain of Sinaloa.

The plant's discharge enters the local drainage network within the Sinaloa coastal plain, flowing toward the Gulf of California. This semi-arid region relies on surface water for irrigation and domestic use, making effluent quality critical for maintaining downstream aquatic habitats. The Gulf of California is a biologically rich marine ecosystem supporting endemic species and migratory corridors. Secondary treatment reduces organic pollution but may not fully address nutrients, which could contribute to eutrophication in receiving waters if not managed.