San Miguel de Horcasitas Wastewater Treatment Plant, Sonora, Mexico

San Miguel de Horcasitas is a wastewater treatment plant located in Los Ángeles, within the municipality of San Miguel de Horcasitas, Sonora, Mexico. It serves a small population of 246 residents, reflecting its role in a rural or peri-urban setting. The plant operates with secondary treatment, which is a standard biological process that significantly reduces organic matter and suspended solids before discharge. As a small-scale facility in Mexico, the plant is subject to national water quality regulations, including NOM-001-SEMARNAT-1996, which sets limits for pollutants in wastewater discharges. The plant's designed capacity is 319.68 cubic meters per day, and it currently discharges an average of 23.33 cubic meters per day, indicating ample capacity for future growth or seasonal variations. The treated effluent is discharged into the local environment, likely into an arroyo or small watercourse that eventually drains into the Gulf of California via the Sonora River basin. The surrounding region is arid to semi-arid, making water quality management crucial for sustaining local ecosystems and agricultural activities. The plant's operation supports the protection of downstream water bodies and the health of the Gulf of California's coastal waters.

The plant discharges into the Sonora River basin, which flows through the arid landscape of Sonora before reaching the Gulf of California. This coastal marine environment supports diverse aquatic life, including fish and invertebrates, and is an important migratory corridor for birds. Effective wastewater treatment is essential to prevent nutrient loading and contamination that could harm these ecosystems.