OczyszczalniaSciekow w Koprzywnicy - Secondary Wastewater Treatment Plant in Koprzywnica, Poland

OczyszczalniaSciekow w Koprzywnicy is a municipal wastewater treatment plant located in Koprzywnica, in the świętokrzyskie province of Poland. The plant serves a population of 1,657, classifying it as a small agglomeration under Polish and EU regulations. It operates with secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive for inland communities of this size. The plant has a designed capacity of 3,375 m³/day and currently discharges 236.26 m³/day of treated wastewater, indicating significant spare capacity. As a secondary treatment facility, it removes organic matter and suspended solids but does not include advanced nutrient removal. Under the EU UWWTD, secondary treatment is mandatory for all agglomerations above 2,000 population equivalent, though smaller plants like this one are also expected to meet basic treatment standards. The treated effluent is discharged into local watercourses that eventually drain into the 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 area.

The plant discharges into the Vistula River basin, which is Poland's largest river system and flows into the Baltic Sea. The local watershed includes small streams and agricultural areas, making nutrient management important to prevent eutrophication downstream. The Vistula estuary supports diverse aquatic ecosystems and is a critical migratory corridor for fish species. The plant's secondary treatment helps reduce organic pollution but does not target nitrogen or phosphorus removal, which could be relevant for Baltic Sea protection efforts.