Ahualulco Wastewater Treatment Plant, Ahualulco, San Luis Potosí, Mexico

Ahualulco wastewater treatment plant is located in the town of Ahualulco, in the state of San Luis Potosí, Mexico. It serves a small population of approximately 685 residents, reflecting its role as a local municipal facility for this inland community. The plant provides secondary treatment, which is the standard biological treatment process that removes organic matter and suspended solids. With a designed capacity of 432 cubic meters per day and a discharge volume matching that figure, the facility operates at full capacity. As a small-scale plant in Mexico, it falls under national water quality regulations administered by CONAGUA (Comisión Nacional del Agua), which sets discharge standards for municipal wastewater. The treated effluent is discharged into the local hydrological system, ultimately draining into the Pánuco River basin and reaching the Gulf of Mexico. The plant plays a key role in protecting local water quality and preventing untreated sewage from entering the region's waterways, supporting both human use and aquatic ecosystems.

The plant discharges into the Pánuco River basin, which flows through central Mexico and empties into the Gulf of Mexico. This watershed supports diverse aquatic life and provides water for agriculture and communities downstream. The secondary treatment helps reduce organic pollution and nutrient loads, protecting the ecological health of the river system and the coastal environment.