Wiazownica Wastewater Treatment Plant, Szówsko, Poland

The Wiazownica wastewater treatment plant is located in Szówsko, within the gmina Wiązownica in województwo podkarpackie, Poland. It serves a population of 6,236, classifying it as a small to medium agglomeration under Polish and EU regulations. The plant is situated inland, away from coastal areas, and plays a key role in managing local wastewater. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size discharging into freshwater. It has a designed capacity of 9,935 m³/day and currently treats an average daily volume of 889.16 m³/day, indicating significant spare capacity for future growth or seasonal variations. Treated effluent from the plant is discharged into local watercourses that ultimately drain into the San River basin, a tributary of the Vistula River, which flows into the Baltic Sea. The plant's operation helps protect the ecological health of these rivers and the downstream Baltic Sea environment by reducing organic and nutrient pollution.

The plant discharges into the San River basin, part of the larger Vistula River system that flows into the Baltic Sea. This watershed supports diverse aquatic life and is an important ecological corridor in southeastern Poland. The secondary treatment process reduces organic load and helps prevent eutrophication in downstream waters, contributing to the health of the Baltic Sea ecosystem.