Gananoque Sewage Lagoons - Wastewater Treatment Plant in Gananoque, Ontario

Gananoque Sewage Lagoons is a municipal wastewater treatment facility serving the town of Gananoque, Ontario, Canada. With a population served of 6,104, the plant is classified as a small agglomeration under Canadian wastewater regulations. The facility is located on Arthur Street in the Eastern Ontario region, near the shores of the St. Lawrence River. As a sewage lagoon system, the plant uses natural treatment processes involving settling and biological degradation. Under Ontario's regulatory framework, such facilities are typically required to meet provincial effluent standards under the Ontario Water Resources Act and the federal Wastewater Systems Effluent Regulations (WSER), which mandate secondary treatment equivalent or better for systems of this scale. The plant's treated effluent ultimately discharges into the St. Lawrence River, a major waterway that drains into the Gulf of St. Lawrence and the Atlantic Ocean. The river supports diverse aquatic life and is an important migratory corridor for fish species. The plant's proximity to the coast (within 50 km) means its discharge can influence downstream estuarine and marine environments.

Gananoque Sewage Lagoons discharges into the St. Lawrence River, which flows northeast through the Thousand Islands region before reaching the Gulf of St. Lawrence and the Atlantic Ocean. The river is a critical freshwater ecosystem supporting diverse fish populations, including lake sturgeon and American eel, and serves as a major migratory route for waterfowl. The plant's location within 50 km of the coast means its effluent can affect downstream estuarine habitats, though the lagoon treatment system provides natural attenuation before discharge.