Daliowa Wastewater Treatment Plant, Posada Jaśliska, Poland

Daliowa wastewater treatment plant is located in Posada Jaśliska, a village in the Podkarpackie Voivodeship of southeastern Poland. The plant was designed to serve the local population with a capacity of 2,400 cubic meters per day, but it is currently closed and no longer operational. The plant provided secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this scale. Under this directive, secondary treatment ensures the removal of biodegradable organic matter and suspended solids, protecting water quality in the receiving environment. The treated effluent would have discharged into local watercourses that drain into the Wisłok River, a tributary of the San River, which eventually flows into the Vistula River and the Baltic Sea. The plant's operation helped safeguard the ecological health of these waterways, supporting aquatic life and downstream communities.

The plant is situated inland in the Carpathian foothills, within the drainage basin of the Wisłok River. The Wisłok flows into the San, a major tributary of the Vistula, which empties into the Baltic Sea. The region supports diverse aquatic ecosystems and is important for migratory fish species. The plant's secondary treatment would have reduced organic pollution, protecting downstream water quality and biodiversity.