Six Nations of the Grand River Communal Sewage Treatment System - Ohsweken, Ontario Wastewater Plant

The Six Nations of the Grand River Communal Sewage Treatment System is located in Ohsweken (Oshwé:ken), Ontario, Canada, serving a population of 1,782 within the Six Nations of the Grand River First Nation. The plant provides secondary treatment, a standard level for small communities in Ontario, and handles an average daily discharge volume of 800 cubic meters. As a secondary treatment facility, the plant uses biological processes to reduce organic matter and suspended solids before discharge. The plant operates under Ontario's regulatory framework, which requires effluent quality standards aligned with the Canada-wide Strategy for the Management of Municipal Wastewater Effluent. For small systems like this, compliance is typically monitored through provincial permits. The treated effluent is discharged into the Grand River watershed, which flows into Lake Erie, part of the Great Lakes system. The Grand River supports diverse aquatic life and is an important water source for communities downstream. The plant's operations contribute to protecting water quality in this ecologically significant basin.

The plant discharges into the Grand River watershed, which flows southward to Lake Erie, the fourth-largest of the Great Lakes. The Grand River supports a variety of fish species, including walleye and smallmouth bass, and provides habitat for migratory birds. Protecting water quality in this basin is critical for downstream communities and the broader Lake Erie ecosystem, which faces challenges from nutrient loading and algal blooms.