Lagune de Saint Francois Wastewater Treatment Plant, Paroisse de Saint-François, New Brunswick

Lagune de Saint Francois is a municipal wastewater treatment plant located in Paroisse de Saint-François, within the Haut-Madawaska region of New Brunswick, Canada. The plant serves a small community of 806 residents, reflecting its role in managing local domestic wastewater. The plant provides secondary treatment, which is the standard biological treatment process that removes organic matter and suspended solids. As a small-scale facility in a rural setting, it operates under Canadian provincial regulations for wastewater, which typically require secondary treatment for communities of this size to protect receiving waters. The treated effluent is discharged into local waterways that drain into the Saint John River system, eventually reaching the Bay of Fundy. The plant plays a key role in safeguarding the water quality of these downstream environments, supporting aquatic life and recreational uses.

The plant discharges into the Saint John River watershed, which flows southward through New Brunswick and into the Bay of Fundy, a globally significant estuary known for its high tidal range and diverse marine habitats. The downstream environment supports fish species such as Atlantic salmon and brook trout, and the plant's secondary treatment helps reduce nutrient loading and protect these ecosystems.