Jastrowie Wastewater Treatment Plant, Wielkopolskie, Poland

The Jastrowie wastewater treatment plant is located in the town of Jastrowie, within the Złotów County of the Wielkopolskie Voivodeship in Poland. It serves a population of approximately 6,599 residents, classifying it as a small to medium agglomeration under Polish and EU regulations. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size discharging into freshwater. The plant's designed capacity is 9,999 m³/day, and it currently treats an average of 940.91 m³/day, indicating ample reserve capacity. The treated effluent is discharged into local watercourses that eventually drain into the Baltic Sea via the Noteć River and the Oder River basin. The plant plays a key role in protecting the region's surface waters from nutrient pollution, supporting aquatic life and downstream ecosystems.

The plant discharges into the local watershed, which is part of the Noteć River catchment, a tributary of the Oder River. The Oder flows into the Baltic Sea, a semi-enclosed sea sensitive to eutrophication from nutrient inputs. The region's aquatic ecosystems support diverse fish and bird species, and the plant's secondary treatment helps reduce organic load and nutrients, mitigating algal blooms and oxygen depletion in downstream waters.