Wolin Wastewater Treatment Plant, Łęgi, West Pomeranian Voivodeship, Poland

The Wolin wastewater treatment plant is located in Łęgi, a village in the West Pomeranian Voivodeship of northwestern Poland. It serves a population equivalent of 4,903, classifying it as a small agglomeration under Polish and EU regulations. The plant is situated near the city of Szczecin and the German border, within the Oder River basin. The facility employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 17,000 m³/day and a current discharge volume of 699.09 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The advanced treatment likely includes nutrient removal to protect sensitive downstream waters. The treated effluent is discharged into local watercourses that eventually drain into the Oder River and then the Baltic Sea. The Oder estuary and the Szczecin Lagoon are ecologically important areas, supporting diverse aquatic life and serving as a migratory corridor for fish. The plant's advanced treatment helps reduce nutrient loads that could contribute to eutrophication in the Baltic Sea.

The plant discharges into the Oder River basin, which flows into the Szczecin Lagoon and then the Baltic Sea. The Baltic Sea is a semi-enclosed sea sensitive to nutrient pollution, where advanced treatment helps mitigate algal blooms and oxygen depletion. The surrounding area includes coastal wetlands and forests that support birdlife and biodiversity.