Las Trancas Wastewater Treatment Plant, Saltillo, Puebla, Mexico

Las Trancas is a wastewater treatment plant located in Saltillo, within the municipality of Lafragua, Puebla, Mexico. The plant provides secondary treatment for a small population of 37 residents, contributing to local sanitation and environmental protection. As a secondary treatment facility, Las Trancas removes organic matter and suspended solids through biological processes, meeting standard requirements for municipal wastewater. The plant has a designed capacity of 3.46 units and operates at full capacity, indicating efficient use of infrastructure. Under Mexican regulations (NOM-001-SEMARNAT-1996), secondary treatment is appropriate for small communities to control pollutant discharges. The treated effluent from Las Trancas is discharged into local water bodies, ultimately draining into the Gulf of Mexico via the Papaloapan River basin. This region supports diverse aquatic ecosystems, and proper wastewater treatment helps maintain water quality downstream, protecting both human health and ecological integrity.

Las Trancas discharges treated wastewater into local streams that flow into the Papaloapan River basin, which drains into the Gulf of Mexico. The surrounding watershed supports agricultural activities and freshwater biodiversity. Effective secondary treatment reduces nutrient and pathogen loads, safeguarding downstream water quality and aquatic habitats.