Usine d'épuration de la Seigneurie - Salaberry-de-Valleyfield Wastewater Treatment Plant

Usine d'épuration de la Seigneurie is a municipal wastewater treatment plant located in Salaberry-de-Valleyfield, Quebec, Canada. The plant serves a population of approximately 46,071 residents in the Beauharnois-Salaberry region, operating as part of the province's wastewater infrastructure. As a Canadian facility in Quebec, the plant operates under provincial environmental regulations administered by the Ministère de l'Environnement et de la Lutte contre les changements climatiques (MELCC). For a community of this size, secondary treatment is typically required to meet effluent quality standards. The plant's operational status is confirmed as active. The treated effluent is discharged into the St. Lawrence River via local waterways, contributing to the broader St. Lawrence River ecosystem. This river system supports diverse aquatic life and serves as a critical migratory corridor for fish species. The plant plays a key role in protecting water quality in the region.

The plant discharges into the St. Lawrence River watershed, which flows northeast through Quebec and into the Gulf of St. Lawrence, eventually reaching the Atlantic Ocean. The St. Lawrence River is a major ecological corridor supporting diverse fish populations, including sturgeon and salmon, and provides habitat for migratory birds. The region's aquatic ecosystems benefit from effective wastewater treatment to maintain water quality.