Zagorze Wastewater Treatment Plant, Sosnowiec, Poland

The Zagorze wastewater treatment plant is located in the Zagorze district of Sosnowiec, within the Silesian Voivodeship in southern Poland. It serves a population of about 13,738, placing it in the category of a small to medium agglomeration under EU classification. As a Polish facility, the plant operates under national regulations that transpose the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size, the directive requires at least secondary treatment, with more stringent standards if the receiving waters are designated as sensitive areas. It is expected to comply with these regulatory requirements. The treated effluent from the plant is discharged into local watercourses that ultimately drain into the Vistula River basin, which flows northward to the Baltic Sea. The plant plays a key role in protecting the region's water quality and supporting the ecological health of downstream aquatic environments.

The plant discharges into the local watershed that feeds into the Przemsza River, a tributary of the Vistula River. The Vistula flows through central Poland and empties into the Baltic Sea via the Vistula Lagoon. This region supports diverse aquatic life and is important for migratory fish species. The plant's treatment helps reduce nutrient loads that could contribute to eutrophication in the Baltic Sea.