Pasym Wastewater Treatment Plant, warmińsko-mazurskie | Poland

The Pasym wastewater treatment plant is located in the town of Pasym, within the warmińsko-mazurskie voivodeship of Poland. It serves a population of 3,691, placing it in the small agglomeration category under Polish and EU regulations. The plant employs advanced treatment processes, which exceed the EU Urban Waste Water Treatment Directive's secondary treatment requirement for agglomerations of this size. With a designed capacity of 4,000 m³/day and an average discharge volume of 526.28 m³/day, the facility operates well within its capacity, ensuring effective treatment of municipal wastewater. The treated effluent is discharged into local watercourses that drain into the Baltic Sea via the Pisa River and the Vistula Lagoon. This inland location reduces direct marine impact, but the advanced treatment helps protect downstream ecosystems, including the sensitive coastal waters of the Baltic Sea.

The plant discharges into local streams that flow into the Pisa River, a tributary of the Narew River, which ultimately reaches the Vistula Lagoon and the Baltic Sea. The Baltic Sea is a brackish, semi-enclosed sea with limited water exchange, making it sensitive to nutrient pollution. Advanced treatment at this plant helps reduce nitrogen and phosphorus loads, supporting the ecological health of the downstream aquatic environment.