Kalisz Pomorski Wastewater Treatment Plant - Poland

The Kalisz Pomorski wastewater treatment plant is located in the town of Kalisz Pomorski, in the powiat drawski region of województwo zachodniopomorskie, Poland. This facility serves a population of approximately 4,851 residents, classifying it as a small to medium agglomeration under Polish and EU regulations. The plant provides secondary treatment, which is the minimum standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The plant has a designed capacity of 7,533 m³/day and currently discharges 691.68 m³/day of treated wastewater. As a Polish facility, it operates under the national water law and is subject to permits issued by the Regional Water Management Board (RZGW). The treated effluent is discharged into a local water body, which ultimately drains into the Baltic Sea via the Drawa River and the Oder River basin. The plant plays a key role in protecting the region's surface waters from nutrient pollution, supporting the ecological health of downstream rivers and the Baltic Sea coastal zone.

The plant discharges into a local watercourse that flows into the Drawa River, a tributary of the Noteć River, which is part of the Oder River basin. The Oder River drains into the Baltic Sea, a semi-enclosed sea sensitive to eutrophication from nutrient loads. The region's watershed supports diverse aquatic life and is important for migratory fish species. The plant's secondary treatment helps reduce organic and nutrient pollution, contributing to the ecological balance of the Baltic Sea catchment.