Williamsburg Lagoon Wastewater Treatment Plant, South Dundas, Ontario

Williamsburg Lagoon is a municipal wastewater treatment facility located in the community of Williamsburg within South Dundas, Ontario. The plant serves a small population of 204 residents and operates under secondary treatment standards, which is typical for small agglomerations in Canada. As a secondary treatment plant, Williamsburg Lagoon utilizes biological processes to remove organic matter and suspended solids from wastewater. The facility discharges an average of 91.40 cubic meters per day. In Ontario, such plants are regulated under the provincial Environmental Protection Act and Ontario Water Resources Act, with permits issued by the Ministry of the Environment, Conservation and Parks. The treated effluent from Williamsburg Lagoon is discharged into a local watercourse that flows into the St. Lawrence River, part of the Great Lakes Basin. The St. Lawrence River is a major ecological corridor supporting diverse aquatic life and connecting the Great Lakes to the Atlantic Ocean. The plant's operations help protect downstream water quality in this sensitive freshwater ecosystem.

The treated effluent from Williamsburg Lagoon enters a local tributary that drains into the St. Lawrence River, a major waterway connecting the Great Lakes to the Atlantic Ocean. The St. Lawrence River supports a diverse range of aquatic species, including fish, invertebrates, and migratory birds. Protecting water quality in this river is critical for maintaining the ecological health of the Great Lakes Basin and the downstream estuary.