STEU Saint Severin Wastewater Treatment Plant, Saint-Séverin, Québec

STEU Saint Severin is a municipal wastewater treatment facility located at 133, Chemin des Moulins in Saint-Séverin, a small community within the Mékinac region of Mauricie, Québec, Canada. The plant serves a population of 882 residents and operates under the regulatory framework of the Canadian Environmental Protection Act and Québec's provincial water quality standards. The plant provides secondary treatment, which involves biological processes to remove organic matter and suspended solids. Secondary treatment is the standard for small Canadian communities under federal and provincial guidelines. The plant's discharge volume is 396.00 cubic meters per day, reflecting the scale of the community it serves. The treated effluent is discharged into local waterways that ultimately drain into the St. Lawrence River via the Batiscan River basin. This region supports diverse aquatic life and is part of a larger watershed that contributes to the ecological health of the St. Lawrence Estuary, a critical habitat for fish and migratory birds.

STEU Saint Severin discharges into the Batiscan River watershed, which flows into the St. Lawrence River and eventually the St. Lawrence Estuary. The estuary is a biologically productive zone supporting fish species like Atlantic sturgeon and American eel, as well as migratory waterfowl. The plant's secondary treatment helps protect this downstream ecosystem from nutrient pollution and pathogens.