Los Valles Wastewater Treatment Plant, Tijuana, Baja California, Mexico

Los Valles is a wastewater treatment plant located in the Zona Río district of Tijuana, Baja California, Mexico. It serves a population of about 10,770 residents, making it a small to medium-sized facility within the city's municipal wastewater infrastructure. The plant is situated in an urban area near the Tijuana River, which flows into the Pacific Ocean. As a Mexican plant, Los Valles operates under the national water quality standards set by the Comisión Nacional del Agua (CONAGUA), which mandate treatment levels appropriate for the receiving water body. For plants of this scale, secondary treatment is typically required to reduce organic pollutants and suspended solids before discharge. It is expected to comply with Mexican Official Standards (NOM-001-SEMARNAT) for wastewater discharge. The treated effluent from Los Valles likely enters the Tijuana River, which flows northwest into the United States near San Diego, California, and ultimately discharges into the Pacific Ocean. This river is a critical waterway for the binational Tijuana River Valley, supporting diverse aquatic and riparian habitats. The plant's operation helps protect downstream ecosystems and coastal water quality in the region.

Los Valles discharges into the Tijuana River watershed, which flows into the Pacific Ocean near the US-Mexico border. The river supports a variety of aquatic life and is an important migratory corridor for birds. The downstream Tijuana River Estuary is an ecologically sensitive area that provides habitat for numerous species, including endangered birds and fish. Proper wastewater treatment is essential to prevent nutrient pollution and protect coastal water quality.