Oakville Southwest Wastewater Treatment Plant - Oakville, Ontario, Canada

The Oakville Southwest Wastewater Treatment Plant is a municipal facility located on Lakeshore Road West in Oakville, Ontario, within the Halton Region. It serves a population of approximately 60,359 residents, classifying it as a medium-sized agglomeration under Canadian wastewater management standards. The plant is situated in the Golden Horseshoe region, a densely populated area along the western shore of Lake Ontario. As a Canadian wastewater treatment facility, it operates under provincial regulations administered by the Ontario Ministry of the Environment, Conservation and Parks. Plants of this scale in Ontario are typically required to provide secondary treatment, with nutrient removal standards applicable to discharges into the Great Lakes basin. The designed capacity is 1.00 (likely in million gallons per day or similar unit), indicating a facility sized to handle the community's wastewater flows. The treated effluent from the plant is discharged into Lake Ontario, one of the five Great Lakes and a critical freshwater resource. The lake supports diverse aquatic life, including fish species such as lake trout and salmon, and provides drinking water for millions. The plant plays a key role in protecting water quality in the lake by reducing pollutant loads from urban runoff and residential sources.

The plant discharges into Lake Ontario, part of the Great Lakes system, which ultimately drains via the St. Lawrence River to the Atlantic Ocean. Lake Ontario supports a complex ecosystem with fish, plankton, and benthic communities, and is a vital drinking water source. The watershed includes urbanized areas of the Golden Horseshoe, making nutrient and contaminant management critical to prevent algal blooms and maintain water quality.