Jednorozec Wastewater Treatment Plant - Jednorożec, Mazovia, Poland

The Jednorozec wastewater treatment plant is located in the village of Czerwona Góra, near the town of Jednorożec in województwo mazowieckie, Poland. It serves a population of approximately 2,005 people, classifying it as a small agglomeration under Polish and EU regulations. As a secondary treatment facility, Jednorozec meets the minimum requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The plant has a designed capacity of 2,717 m³/day and currently discharges 285.88 m³/day of treated effluent, indicating significant spare capacity. The treated wastewater is discharged into local watercourses that ultimately drain into the Narew River basin, a major tributary of the Vistula River. The Vistula flows northward into the Baltic Sea, making the plant part of a larger catchment that supports diverse aquatic ecosystems and migratory fish species.

The plant's discharge enters small streams in the Narew River basin, which flows into the Vistula River and eventually reaches the Baltic Sea. This watershed supports diverse aquatic life, including fish species such as pike and bream, and provides important habitat for migratory birds. The region's moderate climate and agricultural land use mean that nutrient management is a key concern for downstream water quality.