Sewage Lagoon Wastewater Treatment Plant, Port Alberni, British Columbia

Sewage Lagoon is a municipal wastewater treatment facility serving Port Alberni, a city in the Alberni-Clayoquot Regional District of British Columbia, Canada. The plant serves a population of approximately 19,370 and is classified as a medium-sized agglomeration under Canadian wastewater regulations. As a sewage lagoon system, the plant provides natural treatment through settling and biological processes. Canadian facilities of this scale typically operate under provincial permits that require secondary treatment or equivalent performance standards. The plant's designed capacity is 1.00 million liters per day, supporting the local community's wastewater needs. The plant discharges treated effluent into the Somass River system, which flows into the Alberni Inlet and ultimately the Pacific Ocean. The receiving waters support diverse aquatic life, including salmon runs and estuarine habitats. The plant's proximity to the coast (within 50 km) underscores the importance of effective treatment to protect marine ecosystems.

The plant's treated effluent enters the Somass River, which drains into the Alberni Inlet, a fjord-like estuary on Vancouver Island. This water body supports critical salmon spawning grounds and migratory bird populations. The inlet connects to the Pacific Ocean via Barkley Sound, making the area ecologically sensitive to nutrient loading and contaminants. Effective wastewater treatment is essential to maintain water quality for fisheries and recreational use.