DEPURATORE DI PASSO TONALE - Wastewater Treatment Plant in Vermiglio, Italy

DEPURATORE DI PASSO TONALE is a wastewater treatment plant located in Vermiglio, in the Trentino-Alto Adige/Südtirol region of northern Italy. Situated at Passo Tonale in the Italian Alps, the plant serves a population of around 10,000, primarily from the local community and seasonal tourism in the alpine area. As an Italian plant, it operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for agglomerations of this size. The plant's treatment process and capacity are designed to meet these standards, ensuring compliance with national and European regulations for wastewater management in sensitive mountain environments. The treated effluent is discharged into local watercourses that feed into the Oglio River, which flows through the Val Camonica and eventually into Lake Iseo. This alpine watershed supports diverse aquatic life and is important for downstream ecosystems, including the lake's fishery and recreational uses.

The plant discharges into streams that drain into the Oglio River, a major tributary of Lake Iseo in the Po River basin. This alpine watershed is ecologically sensitive, supporting cold-water fish species and serving as a migratory corridor. Downstream, Lake Iseo is a deep subalpine lake with unique oxygen dynamics, making nutrient control critical to prevent eutrophication.