Ostrow Lubelski Wastewater Treatment Plant, Wólka Zawieprzycka, Poland

The Ostrow Lubelski wastewater treatment plant is located in Wólka Zawieprzycka, within the gmina Serniki, powiat lubartowski, województwo lubelskie, Poland. It serves a population of approximately 4,338 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 agglomerations of this size. Its designed capacity is 4,350 m³ per day, with an actual discharge volume of 618.53 m³ per day, indicating operational headroom. The treated effluent is discharged into the local watershed, which ultimately drains into the Wieprz River, a tributary of the Vistula River, and then into the Baltic Sea. The plant plays a key role in protecting the region's water quality and aquatic ecosystems.

The plant discharges into the Wieprz River basin, which flows into the Vistula River and eventually reaches the Baltic Sea. This watershed supports diverse aquatic life and is an important ecological corridor in eastern Poland. The secondary treatment helps reduce nutrient loads, mitigating eutrophication risks in downstream water bodies.