Ustrobna Wastewater Treatment Plant, Zagorzyce, Poland

The Ustrobna wastewater treatment plant is located in Zagorzyce, within the gmina Sędziszów Małopolski in the podkarpackie voivodeship of southeastern Poland. This facility serves a population of 1,367, 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 discharges into freshwater bodies. With a designed capacity of 2,912 m³/day and an actual discharge volume of 194.91 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variations. The treated effluent is discharged into local watercourses that ultimately drain into the Wisłoka River, a tributary of the Vistula River, which flows into the Baltic Sea. The plant plays a key role in protecting the local watershed and downstream ecosystems from untreated wastewater pollution.

The plant discharges into the Wisłoka River basin, part of the Vistula River system that drains into the Baltic Sea. This region supports diverse aquatic life and is important for migratory fish species. The secondary treatment provided helps reduce organic load and nutrient pollution, safeguarding water quality in the downstream environment.