Station d'epuration St Sebastien - Saint-Sébastien, Québec Wastewater Treatment Plant

Station d'epuration St Sebastien is a municipal wastewater treatment facility located in Saint-Sébastien, a small community in the Le Granit region of Québec, Canada. The plant serves a population of approximately 442 residents, reflecting its role in a rural setting. The plant provides secondary treatment, which is the standard biological treatment process for removing organic matter and suspended solids. Under Canadian federal and provincial regulations, secondary treatment is typically required for inland plants of this scale to protect receiving waters. The facility discharges an average of 198.50 cubic meters of treated wastewater per day. The treated effluent is released into local waterways that drain into the Saint-François River basin, part of the larger St. Lawrence River watershed. This system ultimately flows to the St. Lawrence Estuary and the Atlantic Ocean. The plant's operation helps maintain water quality in the region's streams and rivers, supporting aquatic life and downstream ecosystems.

The plant discharges into local streams that feed the Saint-François River, a tributary of the St. Lawrence River. The St. Lawrence River is a major ecological corridor in North America, supporting diverse fish species and migratory birds. The watershed is sensitive to nutrient loading, and secondary treatment helps reduce the risk of eutrophication in downstream water bodies.