DP01402001_CHIURO Wastewater Treatment Plant, Castello dell'Acqua, Lombardy

DP01402001_CHIURO is a wastewater treatment plant located in Castello dell'Acqua, a municipality in the province of Sondrio, Lombardy, Italy. The plant serves a population of approximately 7,000 residents, placing it in the small-to-medium agglomeration category under EU classification. It is situated in the Valtellina valley, a mountainous region in the Italian Alps. As an Italian plant serving fewer than 10,000 people, DP01402001_CHIURO is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment for discharges into freshwater bodies. For agglomerations between 2,000 and 10,000 population equivalent, the directive mandates secondary treatment or equivalent, unless the receiving waters are designated as sensitive areas requiring more stringent treatment. The regulatory framework ensures compliance with national and EU standards. The treated effluent from this plant is discharged into local watercourses that drain into the Adda River, a major tributary of the Po River. The Po River flows eastward across northern Italy before emptying into the Adriatic Sea. The plant plays a key role in protecting the water quality of the Adda River and downstream ecosystems, including the Po Delta, which supports diverse aquatic life and important migratory bird populations.

The plant discharges into local streams that feed the Adda River, which flows through the Valtellina valley and eventually joins the Po River. The Po River is the longest river in Italy and its delta is an ecologically sensitive area supporting diverse aquatic habitats and migratory bird species. The plant's operations help maintain water quality in this alpine watershed, which is important for both local communities and downstream ecosystems.