Imielin Wastewater Treatment Plant, Chełm Śląski, Silesian Voivodeship, Poland

The Imielin wastewater treatment plant is located in Chełm Śląski, within the Silesian Voivodeship of southern Poland. It serves a population of approximately 4,918, classifying it as a small agglomeration under Polish and EU regulations. The plant is situated in the industrial and urbanized region of Upper Silesia, near the city of Katowice. The facility provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The designed capacity is 8,000 m³ per day, with an actual discharge volume of 701.23 m³ per day, indicating significant spare capacity. The plant operates under Polish national regulations that transpose EU directives, ensuring compliance with effluent standards for biological oxygen demand and suspended solids. The treated effluent is discharged into local watercourses that ultimately drain into the Vistula River basin, which flows northward to the Baltic Sea. The plant plays a key role in protecting the region's surface waters from untreated sewage, supporting aquatic life and downstream water quality in the densely populated and industrialized Silesian region.

The Imielin plant discharges into the local tributaries of the Vistula River, Poland's longest river, which flows into the Baltic Sea. The surrounding watershed is part of the Upper Vistula basin, an area with significant industrial and mining activity. The plant's secondary treatment helps reduce organic pollution and nutrient loads, protecting downstream ecosystems and supporting biodiversity in the river and coastal zone.