Poschiavo Li Geri Wastewater Treatment Plant, Cantone, Graubünden

Poschiavo Li Geri is a wastewater treatment plant located in the municipality of Poschiavo, in the canton of Graubünden, Switzerland. The plant serves the local community of Cantone and surrounding areas, with a population equivalent of around 7,448. Situated in the Swiss Alps, the facility plays a key role in managing domestic wastewater in this mountainous region. Switzerland's wastewater treatment standards are governed by the Federal Water Protection Act (Gewässerschutzgesetz), which mandates advanced treatment for all plants. For a plant of this scale, secondary treatment with nutrient removal is typical to protect sensitive alpine water bodies. The plant's design and operation align with these national requirements, ensuring effective pollutant removal before discharge. The treated effluent is released into the local hydrological network, which drains into the Poschiavino River and eventually into the Adda River, a tributary of the Po River that flows into the Adriatic Sea. The alpine watershed is ecologically sensitive, supporting diverse aquatic life and serving as a critical water resource for downstream communities.

The plant discharges into the Poschiavino River, a tributary of the Adda River, which flows into the Po River and ultimately the Adriatic Sea. This alpine watershed is characterized by cold, oxygen-rich waters that support sensitive species such as brown trout. The region's steep terrain and seasonal snowmelt create variable flow conditions, requiring robust treatment to prevent nutrient enrichment and protect downstream aquatic habitats.