Marsh Creek WWTP - Decommissioned Wastewater Treatment Plant in Saint John, New Brunswick

Marsh Creek WWTP is a decommissioned wastewater treatment facility located in the City of Saint John, New Brunswick, Canada. The plant historically served a population of about 14,000 residents, reflecting its role in the municipal wastewater infrastructure of the Saint John area. Its designed capacity was 1.00 million litres per day, indicating a facility sized for a medium-sized community. Although the plant is no longer operational, its legacy is tied to the regulatory framework of Canada's wastewater management. Under the federal Wastewater Systems Effluent Regulations (WSER), plants of this scale are required to meet effluent quality standards for carbonaceous biochemical oxygen demand, suspended solids, and other parameters. The decommissioning suggests that the community's wastewater needs are now met by other regional facilities. The plant's receiving water body was likely Marsh Creek, which drains into the Saint John River and ultimately the Bay of Fundy. The Bay of Fundy is a globally significant marine ecosystem known for its high tides and diverse aquatic life. The decommissioning of this plant may have improved local water quality by consolidating treatment at a larger, more modern facility.

Marsh Creek WWTP discharged into Marsh Creek, a tributary of the Saint John River. The Saint John River flows into the Bay of Fundy, a critical marine environment supporting fisheries, migratory birds, and marine mammals. The decommissioning of this plant reduces local nutrient and contaminant loads, benefiting downstream aquatic ecosystems.