San Diego Wastewater Treatment Plant, Culiacán, Sinaloa, Mexico

The San Diego wastewater treatment plant is located in the city of San Diego, within the municipality of Culiacán, Sinaloa, Mexico. It serves a population of approximately 4,016 people, classifying it as a small-scale municipal facility. The plant is situated inland, more than 10 kilometers from the coast, and plays a role in managing local wastewater in this region of northwestern Mexico. The plant provides secondary treatment, which is the standard biological treatment process for removing organic matter and suspended solids. It has a designed capacity of 388.80 units and currently treats 380.16 units, indicating near-full utilization. As a small agglomeration, the plant operates under Mexico's national water regulations, which require treatment to meet discharge standards for protecting water quality in receiving environments. The treated effluent from the plant likely discharges into a local watercourse that eventually drains into the Pacific Ocean via the Sinaloa river system. The surrounding watershed supports agricultural activities and diverse aquatic habitats. Proper treatment at this facility helps reduce nutrient and pollutant loads, contributing to the ecological health of downstream water bodies and the coastal zone.

The plant discharges into a local drainage network that flows toward the Pacific Ocean, likely through the Sinaloa river basin. This region supports agricultural irrigation and estuarine ecosystems that are important for fish and bird species. Effective secondary treatment reduces organic and nutrient pollution, helping to maintain water quality in downstream rivers and coastal waters, which are vital for local livelihoods and biodiversity.