Sonoita Wastewater Treatment Plant, Sonoyta, Sonora, Mexico

The Sonoita wastewater treatment plant is located in Sonoyta, within the municipality of General Plutarco Elías Calles in the state of Sonora, Mexico. It serves a population of approximately 16,808 residents, classifying it as a medium-sized agglomeration under Mexican wastewater regulations. As a plant in Mexico, it operates under the national water law (Ley de Aguas Nacionales) and is subject to the official Mexican standards (NOM-001-SEMARNAT-1996) which set maximum permissible limits for pollutants in wastewater discharges. The plant's discharge ultimately flows into the Sonoyta River basin, which drains into the Gulf of California (Sea of Cortez). This region is ecologically sensitive, supporting diverse aquatic life and serving as an important migratory corridor for birds. The plant's operations are critical for protecting downstream water quality in this arid region.

The Sonoita plant discharges into the Sonoyta River basin, which flows southward into the Gulf of California. This coastal environment supports a variety of marine species and is part of a larger watershed that includes the Upper Gulf of California and Colorado River Delta biosphere. The region's arid climate makes water resources scarce, and the plant's treated effluent is vital for maintaining local stream flows and preventing contamination of downstream ecosystems.