Santa Engracia Guillermo Zuniga Wastewater Treatment Plant, Estación Santa Engracia, Tamaulipas

Santa Engracia Guillermo Zuniga is a wastewater treatment plant located in Estación Santa Engracia, within the municipality of Hidalgo, Tamaulipas, Mexico. The plant serves a population of approximately 4,564 residents, classifying it as a small-scale facility under Mexican wastewater management frameworks. The plant provides secondary treatment, which is the standard biological treatment process for municipal wastewater in Mexico, as mandated by the national water law (Ley de Aguas Nacionales). Secondary treatment typically involves biological degradation of organic matter, reducing biochemical oxygen demand and suspended solids. The plant has a designed capacity of 518.40 volume units and currently discharges 432.00 volume units, indicating operational activity. The treated effluent is discharged into local water bodies that ultimately drain into the Gulf of Mexico, part of the larger hydrological system of the Sierra Madre Oriental. The plant plays a role in protecting downstream aquatic ecosystems and communities by reducing pollutant loads before discharge.

The plant discharges into the local watershed of the San Fernando River basin, which flows eastward into the Laguna Madre and eventually the Gulf of Mexico. This coastal lagoon system supports diverse aquatic life, including fish and migratory birds, and is ecologically sensitive to nutrient inputs. The secondary treatment helps mitigate eutrophication risks in these downstream waters.