GOS Czarnocin Wastewater Treatment Plant, Czarnocin, Poland

GOS Czarnocin is a municipal wastewater treatment plant located in Czarnocin, within the Łódź Voivodeship of central Poland. The facility serves a population of 1,395, 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 discharges into freshwater from agglomerations of this size. The designed capacity is 5,583 m³/day, though current discharge volume is 198.91 m³/day, indicating significant spare capacity. Treated effluent is discharged into local watercourses that ultimately drain into the Vistula River basin, which flows northward into the Baltic Sea. The plant plays a key role in protecting local streams and groundwater from untreated sewage, supporting aquatic life and downstream water quality.

The plant discharges into local water bodies that are part of the Vistula River basin, Poland's largest river system. The Vistula flows into the Baltic Sea, a semi-enclosed sea sensitive to nutrient pollution. Secondary treatment reduces organic load and suspended solids, helping to prevent eutrophication in downstream waters. The surrounding region is predominantly agricultural, so the plant also helps mitigate nutrient runoff from rural areas.