Pesqueira Wastewater Treatment Plant, Sonora, Mexico

The Pesqueira wastewater treatment plant serves the community of Pesqueira in the municipality of San Miguel de Horcasitas, Sonora, Mexico. This facility provides secondary treatment for a population of 7,685, classifying it as a small agglomeration under Mexican wastewater regulations. As a secondary treatment plant, Pesqueira meets the standard level required for municipal wastewater in Mexico under NOM-001-SEMARNAT-1996, which sets discharge limits for conventional pollutants. The plant has a designed capacity of 44.93 cubic meters per day and currently processes 727.49 cubic meters daily, indicating it operates above its nominal capacity. The treated effluent is discharged into the local environment in the Sonora River basin, which drains into the Gulf of California. The region's arid climate and reliance on water resources make proper wastewater treatment critical for protecting downstream water quality and supporting agricultural and ecological needs.

The plant discharges into the Sonora River basin, which flows through the Sonoran Desert and ultimately reaches the Gulf of California. This arid region depends on limited surface water and groundwater, making treated wastewater an important resource for maintaining streamflow and supporting riparian habitats. The downstream environment includes agricultural areas and sensitive desert ecosystems that benefit from pollution control.