Przemysl Wastewater Treatment Plant: Serving Przemyśl, Poland under EU UWWTD

The Przemysl wastewater treatment plant is located in Przemyśl, a city in southeastern Poland's Podkarpackie Voivodeship. The facility serves a population of around 121,582, classifying it as a large agglomeration under EU standards. Its location near the San River places it within the Vistula River basin, which ultimately drains into the Baltic Sea. As a Polish facility serving over 100,000 people, the plant is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment (tertiary) for discharges into sensitive areas. Poland's national regulations implement this directive, mandating nutrient removal for large plants to protect water quality. The plant's treatment processes are designed to meet these standards, ensuring compliance with environmental permits. The treated effluent is discharged into the San River, a tributary of the Vistula. The Vistula flows northward through Poland, eventually reaching the Baltic Sea via the Gulf of Gdańsk. This river system supports diverse aquatic life and is ecologically important for migratory fish species. The plant's operations help maintain water quality in the San and downstream ecosystems.

The plant discharges into the San River, a major tributary of the Vistula River. The Vistula flows through central Poland and empties into the Baltic Sea via the Gulf of Gdańsk. This watershed supports diverse aquatic habitats and is an important migratory corridor for fish species such as salmon and eel. Nutrient removal at the plant helps prevent eutrophication in the Baltic Sea, a sensitive marine environment.