Baviácora Wastewater Treatment Plant, Sonora, Mexico

The Baviácora wastewater treatment plant is located in the town of Baviácora, Sonora, Mexico. It serves a small population of approximately 2,678 residents, typical of a rural community in the region. The plant operates with secondary treatment, which is the standard level for municipal wastewater in Mexico under NOM-001-SEMARNAT-1996 regulations. The plant has a designed capacity of 224.64 cubic meters per day and currently discharges 430.27 cubic meters daily, indicating it operates above its nominal capacity. As a Mexican facility, it is subject to federal environmental standards that set maximum pollutant limits for discharges into national waters. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into the local watershed, which ultimately drains into the Sonora River basin. This river system flows through the arid Sonoran Desert and supports limited but ecologically important aquatic life. The plant's location inland, over 10 km from the coast, reduces direct marine impact, but its discharge contributes to the water quality of the Sonora River, which is used for irrigation and supports riparian habitats.

The plant discharges into the Sonora River basin, which flows through the Sonoran Desert and eventually reaches the Gulf of California. The river supports a fragile desert ecosystem with species adapted to arid conditions, including native fish and migratory birds. Downstream water quality is critical for agricultural use and maintaining biodiversity in this water-scarce region.