Jerka Wastewater Treatment Plant: Serving Jerka, Poland with Secondary Treatment

Jerka wastewater treatment plant is located in the village of Jerka, within the gmina of Krzywiń in the wielkopolskie voivodeship of Poland. The plant serves a population of 2,060, classifying it as a small 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. It has a designed capacity of 1,608 m³/day and currently treats an average of 293.72 m³/day of wastewater. The treated effluent is discharged into a local watercourse that ultimately drains into the Warta River basin, a major tributary of the Oder River. The Oder flows northward to the Baltic Sea, making the plant part of a larger transboundary river system that supports diverse aquatic ecosystems and is important for regional water quality.

The plant's discharge enters a local stream that feeds into the Warta River, which flows through the Wielkopolska region and joins the Oder River near the German-Polish border. The Oder River basin supports a variety of fish species and migratory birds, and its waters eventually reach the Baltic Sea. The plant's secondary treatment helps reduce organic pollution and protects downstream aquatic habitats from excessive nutrient loading.