Gminna ochyszczalnia Sciekow w Siedliskch - Secondary Wastewater Treatment Plant in Siedliska, Poland

Gminna ochyszczalnia Sciekow w Siedliskch is a municipal wastewater treatment plant located in Siedliska, a village in the gmina of Lubenia, Rzeszów County, Podkarpackie Voivodeship, Poland. The plant serves a population of 694, classifying it as a small agglomeration under Polish and EU regulations. It operates as a secondary treatment facility, which is the standard requirement under 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 7,440 m³/day and currently discharges an average volume of 98.95 m³/day, indicating significant spare capacity. As a secondary treatment plant, it employs biological processes to reduce organic matter and suspended solids, meeting the effluent standards set by Polish water law and EU directives. The facility is part of the national wastewater infrastructure managed by local authorities, ensuring compliance with environmental permits. The treated effluent is discharged into local watercourses that eventually drain into the Wisłok River, a tributary of the San River, which flows into the Vistula River and ultimately the Baltic Sea. The plant plays a vital role in protecting the region's water quality, particularly the Wisłok and San river ecosystems, which support diverse aquatic life and are important for recreation and agriculture in the Subcarpathian region.

The plant discharges into local streams that feed the Wisłok River, a key tributary of the San River within the Vistula basin. The Wisłok and San rivers support diverse aquatic habitats and are important for regional biodiversity, including fish species such as barbel and chub. Downstream, the waters flow through the Carpathian foothills into the Vistula, which empties into the Baltic Sea. The plant's secondary treatment helps reduce nutrient loads, protecting these freshwater ecosystems from eutrophication.