Ganterschwil Wastewater Treatment Plant, Bütschwil-Ganterschwil, St. Gallen

Ganterschwil wastewater treatment plant is located in the municipality of Bütschwil-Ganterschwil, in the Toggenburg district of St. Gallen, Switzerland. The plant serves a population of 1,805 and operates with secondary treatment, a standard level for small agglomerations in Switzerland. The plant has a designed capacity of 2,500 cubic meters per day and currently discharges an average of 819.33 cubic meters per day, indicating a utilization rate well below capacity. As a Swiss facility, it operates under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates appropriate treatment to protect water bodies. The treated effluent is discharged into a local watercourse, likely a tributary of the Thur River, which flows into the Rhine and eventually the North Sea. The plant plays a key role in protecting the local aquatic environment and downstream ecosystems.

The plant discharges into a small stream that drains into the Thur River, a major tributary of the Rhine. The Rhine basin supports diverse aquatic life and is an important migratory corridor for fish. The plant's secondary treatment helps reduce organic load and protect water quality in this sensitive alpine watershed.