Quince de Septiembre Wastewater Treatment Plant, Durango, Mexico

Quince de Septiembre is a municipal wastewater treatment plant located in the city of Durango, in the state of Durango, Mexico. It serves a population of approximately 1,825 residents, placing it in the small agglomeration category. The plant is situated inland, away from coastal areas. The plant provides secondary treatment, which is the standard biological treatment required under Mexican regulations (NOM-001-SEMARNAT) for municipal wastewater. With a designed capacity of 259.20 cubic meters per day and a current discharge volume of 172.80 cubic meters per day, the plant operates below its full capacity. This treatment level ensures reduction of organic matter and suspended solids before discharge. The treated effluent is discharged into a local watercourse that eventually drains into the Pacific Ocean via the Nazas River basin. The plant plays a crucial role in protecting the local watershed from untreated sewage, supporting downstream aquatic ecosystems and water quality in the region.

The plant discharges into a tributary of the Nazas River, which flows through the arid landscape of Durango and ultimately reaches the Pacific Ocean. The Nazas River basin supports diverse aquatic life and is an important water source for agriculture and communities. Proper treatment at Quince de Septiembre helps prevent nutrient pollution and protects the ecological health of this semi-arid watershed.