Annacis Island Wastewater Treatment Plant - Major Facility Serving Metro Vancouver

Annacis Island Wastewater Treatment Plant is a large-scale municipal facility located on Annacis Island in Delta, British Columbia, within the Metro Vancouver Regional District. It serves a population of approximately 1.1 million people, making it one of the largest treatment plants in the region. The plant is situated along the Fraser River, which flows into the Strait of Georgia and ultimately the Pacific Ocean. As a major agglomeration serving over 1 million people, the plant is expected to provide advanced treatment under Canadian regulations, which align with the Canada-wide Strategy for the Management of Municipal Wastewater Effluent. The plant's designed capacity is 1.00 million cubic meters per day, reflecting its role in handling a significant portion of the region's wastewater. Treatment processes are designed to meet stringent effluent quality standards to protect the receiving environment. The plant discharges treated effluent into the Fraser River, a major waterway that supports diverse aquatic ecosystems, including salmon runs and migratory birds. The Fraser River estuary is ecologically sensitive, providing critical habitat for fish and wildlife. Downstream, the river flows into the Strait of Georgia, which connects to the Pacific Ocean, making the plant's performance important for both local and marine water quality.

The plant discharges into the Fraser River, which flows through the Fraser Valley and into the Strait of Georgia, a biologically productive marine environment. The river supports important salmon fisheries and provides habitat for species such as sturgeon and migratory waterfowl. The estuary is a critical stopover for birds along the Pacific Flyway. Effluent quality from the plant directly affects these ecosystems, particularly during low-flow periods when dilution is reduced.