Graceros Wastewater Treatment Plant, Durango, Mexico

Graceros is a wastewater treatment plant located in the town of Graceros, within the municipality of Vicente Guerrero, Durango, Mexico. The facility serves a small population of 1,004 residents, reflecting its role in a rural or peri-urban community. The plant is situated inland, away from coastal zones, and its operations are part of the local water management infrastructure. The plant provides secondary treatment, which is a standard biological process that removes organic matter and suspended solids. With a designed capacity of 103.68 units and an actual discharge volume of 95.04 units, the facility operates at a high utilization rate. In Mexico, wastewater treatment plants are regulated under the National Water Law (Ley de Aguas Nacionales) and NOM-001-SEMARNAT-1996, which sets discharge limits for pollutants. For small communities, secondary treatment is often adequate to meet environmental standards. The treated effluent is discharged into local water bodies, likely contributing to the Nazas River basin or nearby arroyos that drain into the Laguna de Mayran or the Rio Grande de Nazas. These waters support agricultural activities and local ecosystems. The plant's operation helps protect downstream water quality and public health in the region.

The plant discharges into the Nazas River basin, which flows through the arid landscapes of Durango and eventually reaches the Laguna de Mayran, an important endorheic lake. This watershed supports irrigated agriculture and provides habitat for migratory birds and native aquatic species. The secondary treatment process reduces organic pollutants, helping to maintain the ecological balance of the receiving waters.