El Dadho Wastewater Treatment Plant, El Dadhó, Hidalgo, Mexico

El Dadho is a wastewater treatment plant located in the small community of El Dadhó, within the municipality of Chilcuautla, Hidalgo, Mexico. The plant serves a population of 3,195, classifying it as a small-scale facility under Mexican wastewater management standards. Its location in the central highlands of Mexico places it in a semi-arid region with significant agricultural activity. The plant operates with secondary treatment, which is the standard level required by Mexican regulations (NOM-001-SEMARNAT-1996) for discharges into inland water bodies. With a designed capacity of 302.40 cubic meters per day and a discharge volume matching that figure, the facility appears to operate at full capacity. The treated effluent from El Dadho is discharged into local watercourses that ultimately drain into the Tula River basin, part of the larger Pánuco River system flowing to the Gulf of Mexico. This watershed supports agricultural irrigation and provides water for downstream communities. The plant's operation helps protect local water quality in a region where water resources are increasingly stressed by agricultural and urban demands.

The plant discharges into the Tula River basin, which flows through the Mezquital Valley and eventually joins the Moctezuma River, part of the Pánuco River system draining into the Gulf of Mexico. This watershed is ecologically important for sustaining agricultural irrigation and supporting aquatic habitats in a semi-arid region. Downstream water bodies are subject to pressures from agricultural runoff and urban wastewater, making the plant's secondary treatment role critical for maintaining water quality and ecosystem health.