Santa María las Cuevas Wastewater Treatment Plant, Tlaxcala, Mexico

The Santa María las Cuevas wastewater treatment plant is located in the municipality of Atltzayanca, Tlaxcala, Mexico. It serves a population of 1,187, classifying it as a small-scale facility within the national wastewater infrastructure. The plant is situated inland, far from coastal zones, and its operations are part of local efforts to manage domestic wastewater in the region. The plant provides secondary treatment, which is a standard biological process that removes organic matter and suspended solids. With a designed capacity of 129.60 cubic meters per day and an actual discharge volume of 112.32, it operates below its maximum capacity. Under Mexican regulations (NOM-001-SEMARNAT-1996), secondary treatment is appropriate for this scale, ensuring compliance with discharge standards for inland water bodies. The treated effluent is discharged into local watercourses that eventually drain into the Gulf of Mexico via the Pánuco River basin. This downstream connection highlights the plant's role in protecting both local streams and the broader coastal ecosystem from untreated sewage. The surrounding area is primarily agricultural, and the plant helps maintain water quality for irrigation and ecological health.

The plant discharges into the Pánuco River basin, which flows into the Gulf of Mexico. This watershed supports diverse aquatic life and is important for regional agriculture and fisheries. The secondary treatment reduces organic pollutants, protecting downstream ecosystems from eutrophication and pathogen contamination.