Rio Grande Wastewater Treatment Plant, Río Grande, Oaxaca, Mexico

Rio Grande is a wastewater treatment plant located in the municipality of Tututepec, Oaxaca, Mexico, serving the community of Río Grande. The plant provides secondary treatment for a population of 6,389, with a designed capacity of 976.32 m³/day and an average discharge volume of 604.80 m³/day. As a secondary treatment facility, Rio Grande meets the standard level required for municipal wastewater in Mexico under NOM-001-SEMARNAT-1996, which sets permissible limits for pollutants in discharges to national waters. The plant's capacity utilization suggests it operates below its design capacity, indicating room for future growth. The plant's discharge ultimately flows into the Pacific Ocean via local coastal waterways. Its proximity to the coast (within 10 km) means treated effluent enters a sensitive marine environment, where nutrient and pathogen control are critical to protect coastal ecosystems and local fisheries.

The plant discharges into the Pacific coastal zone near Río Grande, Oaxaca. The receiving waters support diverse marine life and are part of a region known for its ecological importance, including mangrove forests and estuaries that serve as nurseries for fish and crustaceans. Proper treatment is essential to prevent eutrophication and protect water quality for tourism and fishing communities.