Usine epuration St Denis sur Richelieu - Saint-Denis, Quebec Wastewater Treatment Plant

Usine epuration St Denis sur Richelieu is a municipal wastewater treatment facility located in Saint-Denis, Quebec, Canada. The plant serves a population of approximately 3,004 residents in the community of Saint-Denis-sur-Richelieu, within the La Vallée-du-Richelieu regional county municipality. As a small-scale treatment plant, it plays a key role in managing local wastewater in this rural area of Montérégie. Under Canadian provincial regulations, wastewater treatment plants in Quebec are subject to the Environment Quality Act and must meet effluent standards set by the Ministère de l'Environnement et de la Lutte contre les changements climatiques. For small communities like Saint-Denis, typical treatment involves primary or secondary processes to reduce organic matter and suspended solids before discharge. The plant's treated effluent is discharged into the Richelieu River watershed, which flows northward into the St. Lawrence River near Sorel-Tracy. The Richelieu River is an important waterway that supports diverse aquatic life and recreational activities. Downstream, the St. Lawrence River is a major ecological corridor in North America, connecting the Great Lakes to the Atlantic Ocean. The plant's operations contribute to protecting water quality in this sensitive riverine environment.

The plant discharges into the Richelieu River, a major tributary of the St. Lawrence River. The Richelieu River watershed supports diverse aquatic ecosystems, including fish species such as walleye and northern pike, and provides habitat for migratory birds. Downstream, the St. Lawrence River is a critical freshwater resource and an ecologically significant waterway that drains into the Gulf of St. Lawrence. Protecting water quality in this system is essential for maintaining biodiversity and supporting local communities.