Krzeszow Wastewater Treatment Plant, Wólka Niedźwiedzka, Podkarpackie

The Krzeszow wastewater treatment plant is located in Wólka Niedźwiedzka, within the gmina of Sokołów Małopolski in the Podkarpackie voivodeship of southeastern Poland. This facility serves a small community of 760 residents, reflecting the rural character of the region. The plant provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations with a population equivalent below 10,000. The designed capacity of 1625 m³/day indicates the plant's ability to handle peak flows, while the current discharge volume of 108.36 m³/day suggests operational levels well within its capacity. The treated effluent is discharged into local watercourses that ultimately drain into the Wisła (Vistula) River basin, which flows northward to the Baltic Sea. The plant plays a key role in protecting the region's surface waters from untreated sewage, supporting aquatic life and downstream water quality in the Vistula catchment.

The plant discharges into small streams that feed into the Wisłok River, a tributary of the San River, which joins the Vistula River before reaching the Baltic Sea. This watershed supports diverse aquatic habitats and is important for migratory fish species. The secondary treatment provided helps reduce organic pollution and nutrient loads, mitigating eutrophication risks in the Baltic Sea.