Slemien Wastewater Treatment Plant, Ślemień, Poland

Slemien wastewater treatment plant is located in the village of Ślemień, within the żywiec county of województwo śląskie, Poland. This small-scale facility serves a population of 271, reflecting its role in managing domestic wastewater for a rural community. The plant is situated in the southern part of Poland, near the Beskid Mountains, an area characterized by rolling hills and a temperate climate. The plant provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Although the directive mandates secondary treatment for all discharges from agglomerations above 2,000 population equivalent, smaller plants like Slemien are still expected to meet appropriate treatment standards to protect local water quality. The plant's designed capacity is 3,594 m³/day, but current discharge volume is 38.64 m³/day, indicating ample reserve capacity. The treated effluent from Slemien likely discharges into a local stream or river that feeds into the Soła River, a tributary of the Vistula River, which ultimately flows into the Baltic Sea. The plant's operation helps protect the local watershed from untreated sewage, supporting aquatic life and downstream water quality in the Vistula basin.

The plant discharges into a local watercourse that is part of the Soła River catchment, which flows into the Vistula River and eventually reaches the Baltic Sea. The surrounding area includes the Beskid Żywiecki landscape, which supports diverse aquatic habitats and is important for regional biodiversity. Proper treatment at Slemien helps prevent nutrient pollution and protects the ecological health of downstream rivers and the Baltic Sea.