etangs aeres Wastewater Treatment Plant, Sainte-Louise, Quebec

The etangs aeres wastewater treatment plant is located in Sainte-Louise, a small municipality in the Chaudière-Appalaches region of Quebec, Canada. Serving a population of 147, this facility is classified as a very small agglomeration under Canadian wastewater management frameworks. The plant is situated near the south shore of the St. Lawrence River, placing it within a coastal environment that influences its discharge considerations. The plant provides secondary treatment, which is the standard level required by the Canadian Wastewater Systems Effluent Regulations (WSER) for most municipal systems. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant's discharge volume is 66.00 cubic meters per day, reflecting its small scale. As a facility in a rural area, it operates under provincial oversight from Quebec's Ministry of the Environment. The treated effluent from the plant ultimately drains into the St. Lawrence River, one of Canada's most significant waterways, which flows into the Gulf of St. Lawrence and the Atlantic Ocean. The coastal location means the plant must manage nutrient levels to protect the sensitive estuarine ecosystem, which supports diverse aquatic life including fish, marine mammals, and migratory birds. The plant's secondary treatment helps reduce the environmental impact on this important water body.

The plant discharges into the St. Lawrence River, a major waterway that drains the Great Lakes basin and flows into the Gulf of St. Lawrence. The coastal zone near Sainte-Louise is part of the St. Lawrence Estuary, an ecologically sensitive area that supports diverse aquatic life, including fish species like Atlantic sturgeon and migratory birds. The estuary is influenced by tidal flows and freshwater inputs, making nutrient management critical to prevent eutrophication in downstream marine environments.