Unidad Habitacional Sumidero Wastewater Treatment Plant, Xalapa, Veracruz

Unidad Habitacional Sumidero is a municipal wastewater treatment facility located in Xalapa, the capital city of Veracruz, Mexico. The plant serves a population of around 8,215 residents, classifying it as a small-scale treatment facility within the region's wastewater infrastructure. The plant provides secondary treatment, which is the standard biological treatment process that removes organic matter and suspended solids. With a design capacity of 777.60 volume units and a discharge volume matching that figure, the facility operates at full capacity. In Mexico, wastewater treatment plants are regulated under the National Water Law (Ley de Aguas Nacionales) and overseen by the National Water Commission (CONAGUA), which sets discharge standards to protect water quality. The treated effluent from the plant is discharged into local water bodies that ultimately drain into the Gulf of Mexico. Xalapa is situated in a mountainous region, and the plant's operations help protect downstream aquatic ecosystems, including rivers and coastal areas, from pollution. The facility plays a key role in maintaining environmental health in the region.

The plant discharges into local streams that flow into the La Antigua River basin, which eventually reaches the Gulf of Mexico. This coastal watershed supports diverse aquatic life and provides important ecosystem services. The secondary treatment process reduces organic pollutants, helping to prevent eutrophication and protect downstream habitats, including mangrove forests and estuaries along the Veracruz coast.