Saint Alexandre Wastewater Treatment Plant, Saint-Alexandre, Quebec

The Saint Alexandre wastewater treatment plant is located at 1400 Montée Lacroix in Saint-Alexandre, Quebec, Canada. It serves a small population of 815 residents in the Le Haut-Richelieu regional county municipality of Montérégie. The plant is currently operational and provides secondary treatment for municipal wastewater. As a secondary treatment facility, the plant meets the minimum standards required under Canadian federal and provincial regulations for wastewater treatment. For small communities like Saint-Alexandre, secondary treatment is typical and ensures removal of organic matter and suspended solids. The plant discharges an average of 366 cubic meters per day. The treated effluent from the plant ultimately reaches the Richelieu River, which flows north into the St. Lawrence River near Sorel-Tracy. The St. Lawrence River is a major waterway that drains into the Gulf of St. Lawrence and the Atlantic Ocean. The plant's proximity to the coast (within 10 km) means its discharge can influence downstream aquatic ecosystems, including the St. Lawrence estuary.

The plant discharges into the Richelieu River watershed, which flows into the St. Lawrence River, one of the largest rivers in North America. The St. Lawrence River supports diverse aquatic life, including fish species like lake sturgeon and American eel, and is an important migratory corridor for birds. The plant's coastal location means its effluent can affect the sensitive estuarine environment of the St. Lawrence, where freshwater meets saltwater, creating unique ecological conditions.