Pierzchow Wastewater Treatment Plant, Pierzchów, Poland

Pierzchow is a wastewater treatment plant located in Pierzchów, a village in the małopolskie province of southern Poland. It serves a small population of 439 residents, reflecting its role in a rural community. The plant is part of Poland's municipal wastewater infrastructure, which operates under the EU Urban Waste Water Treatment Directive (UWWTD). The plant provides advanced treatment, which goes beyond the secondary treatment standard required by the EU UWWTD for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. The plant's designed capacity is 1,500 m³/day, and it currently discharges 62.6 m³/day of treated wastewater, indicating significant spare capacity. The treated effluent is discharged into a local watercourse that ultimately drains into the Vistula River basin, Poland's largest river system. The Vistula flows northward into the Baltic Sea, making the plant's advanced treatment important for reducing nutrient loads that could contribute to eutrophication in the Baltic. The plant helps protect local streams and the broader Vistula catchment.

The plant discharges into a tributary of the Vistula River, which flows through southern Poland and empties into the Baltic Sea via the Gulf of Gdańsk. The Vistula basin supports diverse aquatic life and is an important migratory corridor for fish. Advanced treatment at this plant reduces nutrient pollution, helping to mitigate eutrophication in the Baltic Sea, a sensitive marine environment.