Station d'épuration Régie Rougemont / St-Césaire - Saint-Césaire, Québec Wastewater Treatment Plant

Station d'épuration Régie Rougemont / St-Césaire is a municipal wastewater treatment facility located in Saint-Césaire, within the Montérégie region of Québec, Canada. The plant serves a population of approximately 5,044 residents and is currently operational, providing essential sanitation services to the community. As a small-scale treatment plant in Canada, it operates under provincial regulations administered by the Ministère de l'Environnement et de la Lutte contre les changements climatiques (MELCC). Canadian wastewater treatment standards typically require secondary treatment for inland plants of this size, ensuring compliance with federal and provincial water quality guidelines. The plant discharges treated effluent into local waterways that drain into the Yamaska River basin, which ultimately flows into the St. Lawrence River. This watershed supports diverse aquatic life and is an important ecological corridor in southern Québec, contributing to the overall health of the St. Lawrence ecosystem.

The plant's treated effluent enters the Yamaska River watershed, which flows northward into the St. Lawrence River near Sorel-Tracy. The Yamaska River basin supports a mix of agricultural and urban land uses, and its waters are home to fish species such as walleye and yellow perch. The St. Lawrence River is a major freshwater ecosystem that provides habitat for numerous aquatic species and is a critical migratory route for fish and birds.