Trebaczew Wastewater Treatment Plant, Zalesiaki, Poland

Trebaczew wastewater treatment plant is located in Zalesiaki, within the gmina Działoszyn, powiat pajęczański, województwo łódzkie, Poland. The facility serves a population of approximately 3,615, classifying it as a small agglomeration under Polish and EU regulations. The plant operates with secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland agglomerations of this size. The designed capacity is 7,633 cubic meters per day, with a current discharge volume of 515.44 cubic meters per day, indicating ample reserve capacity. The treated effluent is discharged into local watercourses that drain into the Warta River basin, ultimately reaching the Oder River and the Baltic Sea. The plant plays a key role in protecting local water quality and supporting the ecological health of the region's rivers.

The plant discharges into the Warta River basin, a major tributary of the Oder River, which flows into the Baltic Sea. The local watershed supports diverse aquatic life and is important for migratory fish species. The secondary treatment helps reduce nutrient loads and organic pollution, safeguarding downstream ecosystems.