Samborowo Wastewater Treatment Plant, województwo warmińsko-mazurskie, Poland

The Samborowo wastewater treatment plant is located in the village of Samborowo, within gmina Ostróda, powiat ostródzki, in the warmińsko-mazurskie voivodeship of Poland. It serves a population of 2,792, classifying it as a small agglomeration under Polish and EU regulations. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size discharging into freshwater. The designed capacity is 5,000 m³/day, with a reported discharge volume of 398.10 m³/day, indicating significant reserve capacity. The treated effluent is discharged into local watercourses that ultimately drain into the Vistula Lagoon and the Baltic Sea. The plant plays a key role in protecting the region's surface waters from nutrient pollution, supporting aquatic ecosystems and recreational uses downstream.

The Samborowo plant discharges into local streams that flow into the Drwęca River, a tributary of the Vistula River. The Vistula carries the effluent to the Vistula Lagoon and then the Baltic Sea. This watershed supports diverse aquatic life, including fish species such as pike and perch, and is an important ecological corridor in the region.