Etang Aere Wastewater Treatment Plant, Saint-Ours, Quebec

Etang Aere is a municipal wastewater treatment plant located in Saint-Ours, a small town in the Montérégie region of Quebec, Canada. The plant serves a population of about 1,782 residents and operates under secondary treatment, which is the standard for communities of this size in Canada. As a secondary treatment facility, Etang Aere uses biological processes to break down organic matter, reducing pollutants before discharge. The plant treats an average of 800 cubic meters of wastewater per day. Canadian wastewater regulations, enforced by provincial authorities like the Ministère de l'Environnement du Québec, require secondary treatment for most municipal plants to protect water quality. The treated effluent from Etang Aere is discharged into local waterways that ultimately flow into the St. Lawrence River, one of Canada's most important aquatic ecosystems. The St. Lawrence River supports diverse fish populations and provides drinking water for millions of people. Proper treatment at plants like Etang Aere helps maintain the ecological health of this vital watershed.

The plant's discharge enters local streams that drain into the Richelieu River, a major tributary of the St. Lawrence River. The St. Lawrence River is a critical freshwater ecosystem supporting over 80 fish species and serving as a migratory corridor for eels and other aquatic life. Secondary treatment at this plant helps reduce nutrient loading and organic pollution, protecting downstream habitats in the St. Lawrence estuary.