Jedlnia Letnisko Wastewater Treatment Plant, Wrzosów, Mazowieckie, Poland

The Jedlnia Letnisko wastewater treatment plant is located in Wrzosów, within the gmina of Jedlnia-Letnisko in the Mazowieckie voivodeship of Poland. This facility serves a population of approximately 2,886 people, classifying it as a small agglomeration under Polish and EU regulations. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 6,487.00 m³/day and an actual discharge volume of 411.50 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variations. The treated effluent is discharged into local water bodies, contributing to the protection of the Vistula River basin, which ultimately drains into the Baltic Sea. The plant plays a key role in maintaining water quality in the region, supporting both ecological health and downstream uses.

The plant discharges into the local watershed, which is part of the Vistula River basin. The Vistula flows northward through Poland and empties into the Baltic Sea via the Gdańsk Bay. This region supports diverse aquatic life and is an important ecological corridor for migratory fish species. The secondary treatment provided helps reduce nutrient loads, mitigating eutrophication risks in the Baltic Sea.