Ranizow Borki Wastewater Treatment Plant, Ocieka, Podkarpackie, Poland

Ranizow Borki is a wastewater treatment plant located in Ocieka, within the Podkarpackie Voivodeship of southeastern Poland. The facility serves a population of approximately 2,199 people, 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 inland freshwater discharges from agglomerations of this size. With a designed capacity of 5,000 m³/day and an actual discharge volume of 313.54 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variability. The treated effluent is discharged into a local watercourse that ultimately drains into the Vistula River basin, which flows northward into the Baltic Sea. The plant plays a key role in protecting local streams and the broader Vistula catchment from nutrient pollution, supporting aquatic life and downstream water quality.

The plant discharges into a tributary of the Vistula River, Poland's longest river, which flows into the Baltic Sea. The Vistula basin supports diverse aquatic ecosystems and is an important migratory corridor for fish. Secondary treatment reduces organic load and suspended solids, helping to prevent eutrophication in the Baltic Sea, a region sensitive to nutrient enrichment.