HG Outfall 4 Wastewater Treatment Plant, Harbour Grace, Newfoundland and Labrador

HG Outfall 4 is a municipal wastewater treatment plant located on Water Street in Harbour Grace, Newfoundland and Labrador, Canada. It serves a small population of 668 residents and operates under secondary treatment standards, which involve biological processes to reduce organic matter and suspended solids. The plant discharges approximately 300 cubic meters of treated wastewater daily. As a Canadian facility, it operates under federal and provincial regulations, including the Wastewater Systems Effluent Regulations (WSER) under the Fisheries Act, which set national effluent quality standards for secondary treatment. For a plant of this scale, secondary treatment is the expected minimum. The treated effluent is released into the marine environment of Conception Bay, part of the Atlantic Ocean. Harbour Grace is a coastal community, and the outfall contributes to the local marine ecosystem. The area supports diverse aquatic life, including fish and seabirds, and the plant's operation helps protect water quality in the bay.

The plant discharges into Conception Bay, which opens into the Atlantic Ocean. This coastal environment supports a variety of marine species, including cod, herring, and seabirds. The secondary treatment process reduces pollutants, helping to maintain water quality in the bay and protect downstream ecosystems.