San Miguel de Horcasitas Wastewater Treatment Plant, Sonora, Mexico

San Miguel de Horcasitas wastewater treatment plant is located in the town of San Miguel de Horcasitas, Sonora, Mexico. It serves a small population of 173 residents, reflecting the rural character of the area. The plant provides secondary treatment, which is a standard biological process for removing organic matter and suspended solids. As a small facility in Mexico, the plant operates under the national water quality regulations enforced by the Comisión Nacional del Agua (CONAGUA). These regulations require adequate treatment to protect public health and the environment. The plant has a designed capacity of 38.02 units, with an actual discharge volume of 16.42 units, indicating it operates below its maximum capacity. The treated effluent is discharged into the local watershed, which ultimately drains into the Gulf of California via the Sonora River basin. This coastal connection underscores the importance of effective treatment to prevent nutrient pollution and protect marine ecosystems in the Gulf, a region known for its biodiversity and fisheries.

The plant discharges into the Sonora River basin, which flows into the Gulf of California, a biologically rich sea supporting diverse marine life including shrimp, fish, and migratory species. Effective secondary treatment helps reduce organic load and nutrients that could otherwise contribute to eutrophication in coastal waters. The arid Sonoran climate means water resources are scarce, making treatment and reuse critical for local ecosystems and communities.