San Luis Río Colorado Wastewater Treatment Plant, Sonora, Mexico

San Luis Río Colorado wastewater treatment plant is located in the city of San Luis Río Colorado, Sonora, Mexico, near the US-Mexico border. The plant serves a population of approximately 244,855 people, classifying it as a large agglomeration under Mexican regulatory frameworks. The facility is situated in an arid region with significant agricultural and urban water demands. As a large-scale plant, it is expected to provide at least secondary treatment under Mexican standard NOM-001-SEMARNAT-1996, which sets maximum permissible limits for pollutants in wastewater discharges into national waters. The plant's treatment process and capacity details are not publicly available, but the regulatory framework requires compliance with discharge limits for biochemical oxygen demand, total suspended solids, and other parameters. The plant's treated effluent likely discharges into the Colorado River basin, which flows into the Gulf of California (Sea of Cortez). This river system is ecologically critical, supporting diverse aquatic life and providing water for irrigation and urban use in both Mexico and the United States. The downstream environment includes the Colorado River Delta, a vital wetland ecosystem that supports migratory birds and endemic species.

The plant discharges into the Colorado River basin, which flows into the Gulf of California (Sea of Cortez). The Colorado River Delta is an ecologically sensitive area that supports a rich diversity of aquatic and bird species, including migratory waterfowl. The region's arid climate makes water quality management crucial for maintaining downstream habitats and agricultural water supply.