Bregaglia Maloja Wastewater Treatment Plant - Maloja, Graubünden, Switzerland

Bregaglia Maloja is an advanced wastewater treatment plant located in the village of Maloja, within the municipality of Bregaglia in the canton of Graubünden, Switzerland. The plant serves a small population of 929 residents, reflecting its role in a sparsely populated Alpine region. Its advanced treatment level ensures high-quality effluent suitable for sensitive mountain environments. The plant has a designed capacity of 3,750 cubic meters per day and currently discharges an average volume of 421.69 cubic meters per day. As a Swiss facility, it operates under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates stringent treatment standards for all wastewater discharges, particularly in ecologically sensitive areas. Advanced treatment typically includes nutrient removal to protect receiving waters from eutrophication. The treated effluent from Bregaglia Maloja ultimately flows into the Inn River catchment, which drains into the Danube River basin and eventually reaches the Black Sea. The plant's location in the Upper Engadin valley places it in a high-altitude watershed where cold, oxygen-rich streams support sensitive aquatic life. Its advanced treatment helps preserve water quality in this pristine Alpine environment.

The plant discharges into the Inn River catchment, a headwater system of the Danube basin. The receiving waters are cold, fast-flowing Alpine streams that support sensitive species such as brown trout and the endangered freshwater pearl mussel. Downstream, the Inn River flows through Austria and Germany before joining the Danube, which ultimately reaches the Black Sea. The advanced treatment level is critical for protecting this ecologically sensitive high-altitude watershed from nutrient pollution.