Station d'épuration Auteuil - Wastewater Treatment Plant in Laval, Québec, Canada

Station d'épuration Auteuil is a municipal wastewater treatment plant located in the Auteuil district of Laval, Québec, Canada. It serves a population of approximately 82,075 people, making it a medium-to-large agglomeration within the province's wastewater infrastructure. The plant is situated in the Greater Montreal area, a region with significant urban and industrial activity. As a Canadian facility, the plant operates under provincial and federal regulations, including the Canadian Environmental Protection Act and Québec's Environment Quality Act. For a plant of this scale, secondary treatment is typically required, and discharge permits are issued by the provincial authority (Ministère de l'Environnement et de la Lutte contre les changements climatiques). The plant is expected to meet effluent standards for its receiving environment. The plant's treated effluent is discharged into the local water system, which ultimately flows into the St. Lawrence River via the Mille Îles River or des Prairies River. The St. Lawrence River is a major waterway that drains into the Gulf of St. Lawrence and the Atlantic Ocean, supporting diverse aquatic life and serving as a critical migratory corridor for fish and birds.

The plant discharges into the Mille Îles River or des Prairies River, both of which are tributaries of the St. Lawrence River. The St. Lawrence River flows northeast into the Gulf of St. Lawrence, a large estuary that supports a rich ecosystem including fish species like Atlantic salmon and sturgeon, as well as marine mammals. The watershed is ecologically sensitive due to its role in nutrient cycling and habitat provision for migratory birds. The plant's discharge must comply with provincial standards to protect water quality in this important river system.