Morrisburg Wastewater Treatment Plant - South Dundas, Ontario, Canada

The Morrisburg Wastewater Treatment Plant is located in the community of Morrisburg, part of the Municipality of South Dundas in Eastern Ontario, Canada. This operational facility serves a population of about 3,432 residents, reflecting a small to medium-sized agglomeration typical of rural communities in the region. As a Canadian wastewater treatment plant, it operates under provincial regulations administered by the Ontario Ministry of the Environment, Conservation and Parks. Facilities of this scale in Ontario are typically required to meet secondary treatment standards or equivalent, with effluent quality monitored through provincial permits. The plant's treatment processes are designed to protect local water quality. The plant discharges treated effluent into the local watershed, which ultimately drains into the St. Lawrence River via nearby tributaries. The St. Lawrence River is a major waterway connecting the Great Lakes to the Atlantic Ocean, supporting diverse aquatic life and serving as a critical resource for communities along its course. The plant plays a key role in maintaining the ecological health of this important river system.

The plant's treated effluent enters the local drainage network that flows into the St. Lawrence River, a major international waterway linking the Great Lakes to the Gulf of St. Lawrence and the Atlantic Ocean. The St. Lawrence River supports a diverse ecosystem, including fish species such as sturgeon and walleye, and provides habitat for migratory birds. Protecting water quality in this river is essential for downstream communities and the sensitive estuarine environment of the St. Lawrence estuary.