Lostallo Wastewater Treatment Plant, Sorte, Graubünden, Switzerland

The Lostallo wastewater treatment plant is located in the Sorte area within the municipality of Lostallo, in the canton of Graubünden, Switzerland. Serving a population of around 2,888, this facility is part of the region's municipal wastewater infrastructure, ensuring proper treatment of domestic sewage before discharge. As a Swiss plant, it operates under the national Water Protection Act (Gewässerschutzgesetz), which implements stringent standards aligned with the EU Urban Waste Water Treatment Directive. For agglomerations of this size, secondary treatment is typically required, with additional nutrient removal in sensitive areas. Swiss regulations mandate reliable treatment to protect water quality. The treated effluent is discharged into the local watershed, which drains into the Moësa River, a tributary of the Ticino River, eventually flowing into Lake Maggiore and the Po River system. This water body supports diverse aquatic life and is important for regional biodiversity. The plant plays a key role in maintaining the ecological health of this Alpine river system.

The Lostallo plant discharges into the Moësa River, which flows into the Ticino River and then into Lake Maggiore, a large subalpine lake shared with Italy. This watershed supports diverse aquatic ecosystems, including fish species such as brown trout and grayling. The plant's treatment helps protect downstream water quality in this ecologically sensitive Alpine region.