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

Usine epuration St Charles sur Richelieu is a municipal wastewater treatment plant located in Saint-Charles-sur-Richelieu, Quebec, Canada. It serves a small population of 793 residents in the La Vallée-du-Richelieu region of Montérégie. The plant is operational and provides secondary treatment, which is the standard for small communities in Canada under provincial regulations. The plant treats an average of 356 cubic meters of wastewater per day. As a secondary treatment facility, it uses biological processes to remove organic matter and suspended solids, meeting typical effluent quality standards for inland freshwater discharge. In Quebec, such plants are regulated by the Ministère de l'Environnement et de la Lutte contre les changements climatiques (MELCC) under the Environmental Quality Act. The treated effluent is discharged into the Richelieu River, a major tributary of the St. Lawrence River. The Richelieu River flows north from Lake Champlain to the St. Lawrence near Sorel-Tracy. This watershed supports diverse aquatic life and is an important migratory corridor for fish species. The plant's discharge contributes to the overall water quality of the Richelieu River and ultimately the St. Lawrence ecosystem.

The plant discharges into the Richelieu River, which flows northward into the St. Lawrence River near Sorel-Tracy. The Richelieu River is a key tributary of the St. Lawrence, supporting diverse fish populations and serving as a migratory route for species such as American eel and lake sturgeon. Downstream, the St. Lawrence River flows into the Gulf of St. Lawrence, a major estuary and marine environment. The plant's secondary treatment helps protect water quality in this ecologically sensitive watershed.