Wierzbna Wastewater Treatment Plant, Podkarpackie | Poland

The Wierzbna wastewater treatment plant is located in the village of Wierzbna, within the gmina of Pawłosiów in powiat jarosławski, Podkarpackie Voivodeship, Poland. This facility serves a population of 2,063, 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. With a designed capacity of 1,350 m³/day and an average daily flow of 294.15 m³/day, the plant operates well below its capacity, indicating room for future growth. The treated effluent is discharged into a local watercourse that ultimately drains into the San 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 a local stream that feeds into the San River, part of the Vistula basin, which empties into the Baltic Sea. The region's aquatic ecosystems support diverse species, including migratory fish. Secondary treatment reduces organic load and suspended solids, helping maintain water quality in the sensitive Baltic Sea catchment area.