San Pedro del Gallo Wastewater Treatment Plant, Durango, Mexico

San Pedro del Gallo wastewater treatment plant is located in the town of San Pedro del Gallo, Durango, Mexico. It serves a population of 791 residents, making it a small-scale municipal facility in a semi-arid region of northern Mexico. The plant is situated inland, far from coastal areas, and its operations are part of local water management infrastructure. The plant provides secondary treatment, which is the standard biological treatment stage that removes organic matter and suspended solids. With a designed capacity of 993.60 cubic meters per day and an actual discharge volume of 276.48 cubic meters per day, the facility operates well below its capacity. Mexican 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 into national waters. The treated effluent is discharged into local water bodies, likely arroyos or intermittent streams that drain into the Nazas River basin, part of the endorheic Bolson de Mapimi region. This area is ecologically sensitive, supporting desert-adapted species and seasonal wetlands. Proper treatment is crucial to prevent contamination of scarce water resources in this arid environment.

The plant discharges into local waterways that are part of the Nazas River basin, which flows into the endorheic Bolson de Mapimi, a closed basin with no outlet to the sea. This region is characterized by arid climate and seasonal streams, supporting desert ecosystems with species adapted to water scarcity. The treated effluent contributes to local water availability but must meet strict quality standards to protect the fragile aquatic and riparian habitats.