Atil Wastewater Treatment Plant - Sonora, Mexico

The Atil wastewater treatment plant is located in the small town of Atil, Sonora, Mexico. It serves a population of 532 residents, making it a small-scale municipal facility. The plant provides secondary treatment, which is appropriate for communities of this size in the region. Under Mexico's national water law (Ley de Aguas Nacionales) and NOM-001-SEMARNAT-2021 standards, wastewater treatment plants must meet specific discharge limits for parameters such as biochemical oxygen demand and total suspended solids. Secondary treatment typically achieves these standards for small agglomerations. The plant's designed capacity is 89.86 cubic meters per day, and it currently discharges 125.28 cubic meters daily, indicating operation above design capacity. The treated effluent is discharged into the local environment, likely into an arroyo or small watercourse that drains into the Sonora River basin. This basin ultimately flows into the Gulf of California, an ecologically important marine ecosystem. The plant's operation helps protect downstream water quality and supports the health of the Sonoran Desert watershed.

The plant discharges into the Sonora River basin, which flows through the Sonoran Desert and empties into the Gulf of California. This region supports diverse aquatic life and is an important migratory corridor for birds. The arid climate makes water resources particularly sensitive to pollution, so effective treatment is critical for maintaining ecosystem health.