Jonkowo Wastewater Treatment Plant | Warmian-Masurian, Poland

The Jonkowo wastewater treatment plant is located in the town of Jonkowo, within the Warmian-Masurian Voivodeship in northern Poland. It serves a population of approximately 3,640 residents, classifying it as a small agglomeration under Polish and EU regulations. The plant is situated inland, away from coastal areas, and plays a key role in managing local domestic wastewater. The facility operates at secondary treatment level, which is the minimum standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 670 m³/day and a reported discharge volume of 519.01 m³/day, the plant operates below its capacity. As a secondary treatment plant, it removes organic matter and suspended solids, meeting the directive's requirements for inland discharges. The treated effluent is discharged into local watercourses that eventually drain into the Vistula Lagoon and the Baltic Sea. The plant's operation helps protect the local watershed and downstream aquatic ecosystems from nutrient pollution. Its location in a region with numerous lakes and rivers underscores its importance for maintaining water quality in the area.

The plant discharges into local streams that flow into the Pasłęka River basin, which ultimately reaches the Vistula Lagoon and the Baltic Sea. The region is characterized by numerous glacial lakes and sensitive aquatic habitats that support diverse fish and bird populations. Effective wastewater treatment is crucial to prevent eutrophication and protect the ecological balance of these water bodies.