San Dionisio Ocotepec Wastewater Treatment Plant, Oaxaca, Mexico

San Dionisio Ocotepec wastewater treatment plant is located in the town of San Dionisio Ocotepec, Oaxaca, Mexico. The plant serves a population of approximately 5,476 residents, providing essential sanitation services for this community in the Tlacolula Valley region. The facility operates with secondary treatment, which is appropriate for its scale. Under Mexican regulations (NOM-001-SEMARNAT-1996), secondary treatment is standard for municipal wastewater to reduce organic matter and suspended solids before discharge. The plant has a designed capacity of 518.40 cubic meters per day, matching the reported discharge volume. The treated effluent is discharged into the local watershed, which ultimately drains into the Pacific Ocean via the Tehuantepec River basin. The plant plays a key role in protecting downstream water quality and ecosystems in the region.

The plant discharges into the Tehuantepec River basin, which flows into the Pacific Ocean. This watershed supports diverse aquatic life and is important for local agriculture and fisheries. The region's semi-arid climate means water resources are limited, making effective wastewater treatment critical for maintaining water quality and ecological balance.