ETANG RANG DES GAGNON Wastewater Treatment Plant, Saint-Pamphile, Québec

ETANG RANG DES GAGNON is a wastewater treatment facility located in Saint-Pamphile, within the L'Islet Regional County Municipality of Québec, Canada. The plant serves a population of about 2,155 residents, reflecting a small rural agglomeration typical of the Chaudière-Appalaches region. As a municipal plant in Québec, it operates under the provincial Environment Quality Act and the Regulation respecting municipal wastewater treatment works. For small communities, treatment typically involves lagoons or primary treatment, with effluent quality standards set by the Ministère de l'Environnement et de la Lutte contre les changements climatiques (MELCC). The plant's operational status is confirmed as active. The treated effluent is discharged into local waterways that drain into the St. Lawrence River via the Chaudière River basin. The St. Lawrence River is a major ecological corridor supporting diverse aquatic life, including fish species such as Atlantic sturgeon and American eel. The plant's location inland, over 50 km from the coast, reduces direct marine impact.

The plant discharges into a tributary of the Chaudière River, which flows north into the St. Lawrence River near Québec City. The St. Lawrence River is a critical freshwater and estuarine ecosystem, supporting migratory fish, waterfowl, and diverse benthic communities. The Chaudière River watershed is primarily agricultural and forested, with seasonal flow variations. Proper treatment is essential to protect downstream water quality and aquatic habitats.