Alexandria Sewage Works - North Glengarry, Ontario Wastewater Treatment Plant

Alexandria Sewage Works is a municipal wastewater treatment facility located in North Glengarry, Ontario, Canada. It serves a population of approximately 4,100 residents in the community of Alexandria and surrounding areas within the United Counties of Stormont, Dundas and Glengarry. As a Canadian plant, Alexandria Sewage Works 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 Environmental Compliance Approvals (ECAs) that set site-specific limits for parameters such as biochemical oxygen demand and total suspended solids. The plant's treated effluent is discharged into a local watercourse that flows into the South Nation River, part of the Ottawa River watershed, which ultimately drains into the St. Lawrence River. This waterway supports diverse aquatic life and is an important migratory corridor for fish species in Eastern Ontario.

The treated effluent from Alexandria Sewage Works enters a local tributary that flows into the South Nation River, a major tributary of the Ottawa River. The Ottawa River then empties into the St. Lawrence River, which drains into the Atlantic Ocean. The South Nation River watershed supports diverse aquatic habitats and is important for fish spawning and migratory species. The region's agricultural land use means nutrient management is a key environmental consideration to prevent eutrophication in downstream waters.