Strzalkowo Wastewater Treatment Plant, Strzałkowo, Greater Poland Voivodeship

The Strzalkowo wastewater treatment plant is located in the town of Strzałkowo, within the powiat słupecki of Greater Poland Voivodeship (województwo wielkopolskie). The facility serves a population of approximately 6,499 residents, classifying it as a small to medium agglomeration under Polish and EU regulations. The plant operates with secondary treatment, which is the minimum required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland freshwater discharges from agglomerations of this size. The designed capacity of 7,400 m³/day indicates the facility is sized to handle current and near-future loads. The actual discharge volume of 926.66 m³/day suggests operational capacity utilization is well below design, possibly reflecting seasonal or demographic factors. Treated effluent from the plant is discharged into local watercourses that ultimately drain into the Warta River basin, a major tributary of the Oder River system. The Warta River flows through central Poland and eventually reaches the Baltic Sea via the Oder estuary. The plant's operations help protect the regional aquatic environment from nutrient and organic pollution, supporting water quality in the Warta catchment.

The Strzalkowo plant discharges into local streams that are part of the Warta River basin, which flows into the Oder River and ultimately the Baltic Sea. The Warta basin supports diverse freshwater habitats and is an important ecological corridor for migratory fish. The plant's secondary treatment reduces organic load and nutrients, helping to prevent eutrophication in downstream waters.