Zarzecze Wastewater Treatment Plant, Podkarpackie Voivodeship, Poland

The Zarzecze wastewater treatment plant is located in the village of Zarzecze, in the Podkarpackie Voivodeship of southeastern Poland. It serves a population of 2,603, classifying it as a small agglomeration under Polish and EU regulations. The plant is situated inland, away from coastal areas, and treats municipal wastewater from the local community. The facility 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. The plant has a designed capacity of 1,655 m³/day and currently treats an average of 371.15 m³/day, indicating significant spare capacity. As a Polish municipal plant, it operates under the national water law and is subject to permits issued by the Regional Water Management Board (RZGW). The treated effluent is discharged into a local watercourse, likely a tributary of the San River, which flows into the Vistula River and eventually into the Baltic Sea. The plant plays a key role in protecting the local watershed from untreated sewage, supporting water quality in the region's rivers and downstream ecosystems.

The plant discharges into a local stream that feeds into the San River, a major tributary of the Vistula River. The Vistula flows northward into the Baltic Sea, making the plant part of a large transboundary basin. The surrounding area is predominantly agricultural, and the plant helps prevent nutrient pollution that could cause eutrophication in downstream waters. The region supports diverse aquatic life, including fish species such as salmon and trout in the San River.