Niedzwiada Wastewater Treatment Plant, Tarło, Poland

The Niedzwiada wastewater treatment plant is located in Tarło, a village within the gmina of Niedźwiada in powiat lubartowski, województwo lubelskie, Poland. The plant serves a small population of 6 people, reflecting its role in a rural setting. It operates under Polish regulations that transpose the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant provides secondary treatment, which is the standard biological treatment required for all agglomerations under the EU directive. Although the designed capacity is 2850 m³/day, the actual discharge volume is 0.86 m³/day, indicating that the plant operates well below its capacity. This suggests the plant was built to accommodate future growth or seasonal variations. The treated wastewater is discharged into local water bodies that eventually drain into the Wieprz River, a tributary of the Vistula River. The Vistula flows northward into the Baltic Sea. The plant's operation helps protect the local watershed and downstream aquatic ecosystems from untreated sewage.

The plant discharges into small streams that feed the Wieprz River, a major right-bank tributary of the Vistula. The Vistula River basin supports diverse aquatic life and is an important ecological corridor in Poland. The region's rural landscape relies on healthy water bodies for agriculture and biodiversity. Secondary treatment reduces organic pollutants and nutrients, helping to prevent eutrophication in downstream waters.