Etangs aeres St Cyprien Wastewater Treatment Plant, Saint-Jean-de-Dieu, Quebec

Etangs aeres St Cyprien is a municipal wastewater treatment facility located on Route 295 in Saint-Jean-de-Dieu, within the Bas-Saint-Laurent region of Quebec, Canada. The plant serves a small community of approximately 1,091 residents, providing secondary treatment to meet provincial and federal environmental standards. The plant operates under Quebec's wastewater regulations, which align with the Canadian Council of Ministers of the Environment (CCME) guidelines. For small agglomerations like this, secondary treatment is the standard requirement to reduce organic matter and suspended solids before discharge. The treated effluent is discharged into a local watercourse that eventually drains into the St. Lawrence River, a major waterway connecting the Great Lakes to the Atlantic Ocean. This downstream environment supports diverse aquatic life and is an important ecological corridor for migratory fish species.

The plant discharges into a tributary of the St. Lawrence River, which flows into the Gulf of St. Lawrence and ultimately the Atlantic Ocean. The receiving waters support diverse aquatic ecosystems, including fish populations such as Atlantic salmon and brook trout. The region's watershed is characterized by mixed forest and agricultural land use, requiring careful management of nutrient loads to prevent eutrophication.