Epuration Parc Industriel Wastewater Treatment Plant, Coteau-du-Lac, Quebec

Epuration Parc Industriel is a municipal wastewater treatment facility located at 225 Rue de l'Acier in Coteau-du-Lac, Quebec, Canada. The plant serves a small population of 546 residents within the Vaudreuil-Soulanges region of Montérégie, providing secondary treatment for the local industrial park and surrounding community. The plant operates under Canada's federal wastewater regulations, which require secondary treatment for all systems discharging to surface waters. As a small-scale facility, it is subject to the Wastewater Systems Effluent Regulations (WSER) under the Fisheries Act, which set national effluent quality standards for carbonaceous biochemical oxygen demand, suspended solids, and residual chlorine. The treated effluent is discharged into the local watershed, which ultimately drains into the St. Lawrence River via the Ottawa River system. This region supports diverse aquatic life and is an important migratory corridor for fish species. The plant's secondary treatment helps protect downstream water quality in the St. Lawrence River ecosystem.

The plant discharges into the local watershed that flows into the Ottawa River, a major tributary of the St. Lawrence River. The St. Lawrence River is a critical freshwater ecosystem supporting diverse fish populations, including lake sturgeon and American eel, and serves as a vital migratory route for aquatic species. The secondary treatment provided by the plant helps reduce nutrient and organic loading, protecting downstream habitats in the St. Lawrence River and its estuary.