Cape Mudge Band Aerated Lagoon - Secondary Wastewater Treatment in Discovery Islands, BC

Cape Mudge Band Aerated Lagoon is a wastewater treatment facility located on Weway Road in Area B (Discovery Islands/Mainland Inlets), within the Strathcona Regional District of British Columbia, Canada. The plant serves a small population of 145 residents and operates with secondary treatment, which is appropriate for its scale and remote coastal setting. As a secondary treatment plant, Cape Mudge Band Aerated Lagoon provides biological treatment to reduce organic matter and suspended solids before discharge. The facility is situated within 10 km of the coast, indicating its effluent likely enters a marine environment. Under Canadian regulations, such plants must meet federal and provincial effluent quality standards, including the Wastewater Systems Effluent Regulations (WSER), which mandate secondary treatment or equivalent for systems discharging to sensitive waters. The plant's discharge ultimately reaches the coastal waters of the Discovery Islands region, part of the Salish Sea ecosystem. This area supports diverse marine life, including salmon, herring, and orcas, making proper treatment essential to protect water quality and aquatic habitats. The facility's small scale and secondary treatment help mitigate environmental impact in this ecologically sensitive coastal zone.

The plant discharges into the coastal waters of the Discovery Islands, which are part of the larger Salish Sea ecosystem. This region supports critical marine habitats, including eelgrass beds and kelp forests, that provide nursery grounds for fish and invertebrates. The nearby coastline features rugged inlets and tidal channels that influence local water circulation and dilution of treated effluent. Protecting water quality is vital for sustaining the area's biodiversity and supporting traditional Indigenous uses of marine resources.