DP01307401_COLONNO Wastewater Treatment Plant, Colonno, Lombardy, Italy

DP01307401_COLONNO is a wastewater treatment plant located in Colonno, a municipality in the province of Como, Lombardy, Italy. The plant serves a population of approximately 8,215 residents, placing it in the category of small to medium agglomerations under European Union classification. Situated along Strada statale 340 Regina, the facility is part of the regional wastewater infrastructure managed by local authorities. As a plant operating within the European Union, DP01307401_COLONNO is subject to the Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size, the directive requires secondary treatment as a minimum standard, with more stringent requirements if the discharge enters a sensitive area. The regulatory framework ensures compliance with EU standards for effluent quality. The plant discharges treated wastewater into the local water system, which ultimately drains into Lake Como, a major subalpine lake in Lombardy. Lake Como is a significant ecological and recreational resource, supporting diverse aquatic life and serving as a drinking water source for downstream communities. The plant's operations contribute to protecting the lake's water quality from nutrient pollution and other contaminants.

The plant's treated effluent enters the local drainage network that flows into Lake Como, a large glacial lake in the Italian Alps. Lake Como is a deep, oligotrophic lake that supports a unique ecosystem, including endemic fish species and migratory birds. The lake's water quality is sensitive to nutrient inputs, which can lead to eutrophication. Downstream, the lake's outlet, the Adda River, flows through the Po Valley and eventually reaches the Adriatic Sea, making the plant's performance important for both local and downstream aquatic environments.