Ilanz/Glion Pitasch Wastewater Treatment Plant, Graubünden, Switzerland

Ilanz/Glion Pitasch is a secondary-level wastewater treatment plant located in the municipality of Ilanz/Glion, in the Surselva region of Graubünden, Switzerland. Serving a small population of 144 residents, the plant manages an average daily flow of 65.37 cubic meters against a designed capacity of 338 cubic meters, indicating ample reserve capacity for future growth. The plant provides secondary treatment, which is the standard biological treatment required under Swiss water protection law (Gewässerschutzgesetz). Switzerland's stringent regulations mandate that all wastewater receive at least secondary treatment before discharge, with larger agglomerations requiring tertiary treatment for nutrient removal. As a small facility, Ilanz/Glion Pitasch meets the national requirements for its scale. The treated effluent is discharged into the local watershed, which ultimately drains into the Rhine River via the Vorderrhein. The Rhine flows north through Switzerland, Germany, and the Netherlands before reaching the North Sea. The plant's operation helps protect the sensitive alpine aquatic ecosystems and downstream water quality in the Rhine basin.

The plant discharges into the Vorderrhein catchment, part of the Upper Rhine basin. This alpine region supports diverse aquatic life, including brown trout and other cold-water species. The Rhine ultimately flows to the North Sea, making local treatment crucial for downstream water quality in Switzerland, Germany, and the Netherlands.