Killarney Wastewater Treatment Lagoon - Secondary Treatment Facility in Killarney, Ontario

Killarney Wastewater Treatment Lagoon is a municipal wastewater facility located on Lighthouse Trail in Killarney, Ontario, within the Sudbury District. It serves a small population of 246 residents, reflecting the rural and remote character of this Lake Huron shoreline community. The plant provides secondary treatment, a standard level for small Canadian communities under provincial regulations. Ontario's wastewater framework requires secondary treatment for surface water discharges, and the lagoon system is a common cost-effective solution for low-population areas. The facility's discharge volume is 403 cubic meters per year. The treated effluent is released into the local watershed, which drains into Georgian Bay, part of Lake Huron and the larger Great Lakes system. This region supports diverse aquatic life and is important for recreational fishing and tourism. The plant's coastal proximity necessitates careful operation to protect water quality in the bay.

The plant discharges into the watershed of Georgian Bay, a large bay of Lake Huron within the Great Lakes system. This area supports cold-water fish species such as lake trout and whitefish, and provides critical habitat for migratory birds. The coastal location means effluent must be managed to prevent nutrient loading and algal blooms in the bay's nearshore zones.