Saint Thomas 61027 1 Wastewater Treatment Plant, Saint-Thomas, Québec

Saint Thomas 61027 1 is a municipal wastewater treatment plant located at 1072 Rue Thomas-Brassard in Saint-Thomas, Québec, within the Joliette regional county municipality. The plant serves a small population of 1,276 residents, reflecting the rural character of the Lanaudière region. The facility provides secondary treatment, which is the standard required under Canadian federal and provincial regulations for communities of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids, ensuring effluent meets environmental quality standards before discharge. The plant's treated effluent is released into the local watershed, which ultimately drains into the St. Lawrence River via the L'Assomption River system. The St. Lawrence River is a major ecological corridor supporting diverse aquatic life and migratory fish species. The plant's operation helps protect downstream water quality in this sensitive freshwater ecosystem.

The plant discharges into the L'Assomption River watershed, which flows into the St. Lawrence River near Montreal. The St. Lawrence River is a critical freshwater ecosystem supporting over 100 fish species and serving as a migratory route for eels and sturgeon. The plant's secondary treatment helps reduce nutrient loading and protect downstream aquatic habitats.