TIRES Wastewater Treatment Plant, Sarntal - Sarentino, Italy

TIRES is a closed wastewater treatment plant located in the municipality of Sarntal - Sarentino, in the Trentino-Alto Adige/Südtirol region of northern Italy. The plant served a population of approximately 3,041 people, reflecting a small alpine community. Its location in the South Tyrolean Alps places it within a mountainous, rural setting. The plant provided primary treatment, which involves physical sedimentation to remove settleable solids. As a small agglomeration under the EU Urban Waste Water Treatment Directive (91/271/EEC), primary treatment may have been considered adequate for discharge into less sensitive mountain streams, though the directive generally requires secondary treatment for inland freshwater discharges. The plant's designed capacity was 3,200 m³/day, with an actual discharge volume of 602.01 m³/day, indicating it operated well below capacity before closure. The treated effluent was discharged into local watercourses that drain into the Talfer River, a tributary of the Eisack River, which flows into the Adige River. The Adige eventually reaches the Adriatic Sea near Venice. The alpine watershed supports sensitive aquatic ecosystems, including cold-water fish species such as brown trout, and the region is known for its high water quality standards under both EU and Italian regulations.

The plant discharged into the Talfer River basin, which feeds the Eisack River, a major tributary of the Adige River. The Adige flows through northeastern Italy into the Adriatic Sea. This alpine watershed supports diverse aquatic life, including native fish populations, and is subject to strict water quality protections under the EU Water Framework Directive. The mountainous terrain and seasonal snowmelt influence flow regimes, making consistent treatment important for ecological stability.