Depuratore di Spiazzo Wastewater Treatment Plant, Borzago, Trentino-Alto Adige

Depuratore di Spiazzo is a municipal wastewater treatment plant located in Borzago, within the Spiazzo municipality in the Val Rendena valley of Trentino-Alto Adige, Italy. The plant serves a population equivalent of about 12,726, placing it in the medium agglomeration category under EU regulations. As an Italian facility, the plant operates under the national transposition of the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size, the directive requires secondary treatment or equivalent, with more stringent requirements if the discharge enters a sensitive area. The regulatory framework ensures compliance with European standards. The plant discharges into the local water system within the Sarca River basin, which flows through the Giudicarie valleys and eventually into Lake Garda, one of Italy's largest and most ecologically significant lakes. The downstream environment supports diverse aquatic life and is a key resource for tourism and agriculture in the region.

The plant's treated effluent enters the Sarca River basin, which drains into Lake Garda via the Mincio River. Lake Garda is a large subalpine lake that supports diverse aquatic ecosystems, including endemic fish species and migratory birds. The watershed is sensitive to nutrient inputs, making effective wastewater treatment critical for preventing eutrophication and maintaining water quality for recreation and biodiversity.