Lo de Reyes Wastewater Treatment Plant, Sinaloa, Mexico

Lo de Reyes is a wastewater treatment plant located in the town of Lo de Reyes, within the municipality of Navolato, Sinaloa, Mexico. The plant serves a population of approximately 913 residents, reflecting its role as a small-scale municipal facility in a rural or peri-urban setting. The plant provides secondary treatment, which is the standard biological treatment process for removing organic matter and suspended solids. With a designed capacity of 129.60 m³/day and an average discharge volume of 86.40 m³/day, the facility operates below its full capacity. Under Mexican regulations (NOM-001-SEMARNAT-1996 and subsequent updates), secondary treatment is required for discharges into national waters, and the plant likely holds a federal discharge permit from CONAGUA. The treated effluent is discharged into local water bodies that ultimately drain into the Pacific Ocean via the Sinaloa River system or nearby coastal lagoons. The region's agricultural and coastal ecosystems depend on proper wastewater management to prevent nutrient pollution and protect aquatic biodiversity.

The plant's discharge enters the local drainage network in the Sinaloa lowlands, which flows toward the Pacific coast. This area includes important wetlands and estuaries that support migratory birds and marine life. Proper secondary treatment helps reduce organic load and pathogens, safeguarding downstream water quality for irrigation and ecosystem health.