Kazimierza Wielka Wastewater Treatment Plant | Poland

The Kazimierza Wielka wastewater treatment plant is located in the town of Kazimierza Wielka, in województwo świętokrzyskie, Poland. It serves a population of 4,346, classifying it as a small agglomeration under Polish and EU regulations. The plant is situated inland, away from coastal areas, and treats municipal wastewater from the local community. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 18,990 m³/day and an actual discharge volume of 619.67 m³/day, the plant operates well below its capacity, indicating room for future growth. As a Polish facility, it operates under national regulations that transpose EU directives, with permits issued by the regional water management authority. 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 water quality, particularly in the context of the sensitive Baltic Sea catchment, where nutrient reduction is a priority under the Helsinki Convention.

The plant discharges into the local watershed, which is part of the Vistula River basin. The Vistula flows through central Poland and empties into the Baltic Sea via the Gdańsk Bay. The Baltic Sea is a semi-enclosed, brackish sea sensitive to eutrophication from nutrient inputs. Advanced treatment at this plant helps reduce nitrogen and phosphorus loads, contributing to the health of downstream aquatic ecosystems and supporting biodiversity in the Vistula delta and coastal waters.