Oaxaca Wastewater Treatment Plant, Estación Delta, Baja California, Mexico

The Oaxaca wastewater treatment plant is located in Estación Delta, a locality in the municipality of Mexicali, Baja California, Mexico. It serves a small population of approximately 2,647 residents, providing secondary treatment for municipal wastewater. The plant is situated inland, away from coastal areas, and operates as part of the region's water infrastructure. The plant employs secondary treatment processes, which are standard for small communities in Mexico under the country's water regulations (NOM-001-SEMARNAT). With a designed capacity of 345.60 m³/day and an average discharge volume of 250.56 m³/day, the facility operates below its full capacity. Mexican regulations require treated wastewater to meet quality standards for discharge into water bodies or for reuse. The treated effluent is discharged into local watercourses that ultimately drain into the Colorado River basin or the Gulf of California. The plant plays a key role in protecting downstream water quality and supporting the ecological health of the region's arid environment. Its operation helps prevent untreated sewage from affecting agricultural areas and natural habitats.

The plant discharges into the Colorado River basin, which flows into the Gulf of California (Sea of Cortés). This watershed supports diverse aquatic life and is an important migratory corridor for birds. The region's arid climate makes water quality management critical for both human use and ecosystem health. The plant's secondary treatment reduces organic pollutants and pathogens, protecting downstream water bodies from eutrophication and contamination.