Ejutla Wastewater Treatment Plant, Ejutla de Crespo, Oaxaca, Mexico

The Ejutla wastewater treatment plant is located in the town of Ejutla de Crespo, in the state of Oaxaca, Mexico. It serves a population of 1,825 people, making it a small-scale municipal facility. The plant is situated inland, away from coastal areas, and its operations are part of the local sanitation infrastructure. The plant provides secondary treatment, which is a standard biological process that removes organic matter and suspended solids. With a designed capacity of 432.00 m³/day and an actual discharge volume of 172.80 m³/day, the facility operates well below its capacity. In Mexico, wastewater treatment plants are regulated under the National Water Law and the Federal Law for the Prevention and Control of Pollution, with oversight by the National Water Commission (CONAGUA). The treated effluent is discharged into local water bodies that eventually drain into the Pacific Ocean via the region's river systems. The plant plays a key role in protecting the local environment by reducing pollution loads in the watershed, which supports aquatic life and downstream communities.

The plant discharges into the local watershed of the Atoyac River basin, which flows through the Central Valleys of Oaxaca and ultimately reaches the Pacific Ocean. The region's aquatic ecosystems support diverse species, including fish and migratory birds. Proper treatment helps prevent eutrophication and maintains water quality for downstream uses.