Wierzawice Wastewater Treatment Plant | Podkarpackie, Poland

The Wierzawice wastewater treatment plant is located in the village of Wierzawice, gmina Leżajsk, in the podkarpackie province of southeastern Poland. The facility serves a population of 2,528, 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 freshwater discharges from agglomerations of this size. It has a designed capacity of 3,260 m³/day and currently treats an average daily flow of 360.45 m³/day, indicating significant reserve capacity. The treated effluent is discharged into local watercourses that drain into the San River basin, a tributary of the Vistula River, which ultimately flows into the Baltic Sea. The plant plays a key role in protecting the region's surface water quality and supporting the ecological health of the downstream aquatic environment.

The plant discharges into the San River catchment, part of the Vistula basin that drains to the Baltic Sea. The region supports diverse aquatic life and is important for migratory fish species. Secondary treatment helps reduce organic load and nutrient inputs, mitigating eutrophication risks in downstream waters.