Chelmsko Slaskie Wastewater Treatment Plant, Chełmsko Śląskie, Poland

The Chelmsko Slaskie wastewater treatment plant is located in Chełmsko Śląskie, a town in the Kamienna Góra County of Lower Silesian Voivodeship, Poland. It serves a population of 711, 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 bodies. Under the EU UWWTD, agglomerations with a population equivalent (PE) between 2,000 and 10,000 are generally required to have secondary treatment. Although the population served here is below 2,000, the plant's secondary treatment ensures compliance with Polish national standards, which often align with EU directives. The plant has a designed capacity of 3,100 m³/day, indicating it is sized to handle additional flow from future growth or stormwater. The treated effluent is discharged into local watercourses that eventually drain into the Oder River basin, which flows northward to the Baltic Sea. The plant plays a key role in protecting the region's water quality, particularly in the Sudetes foothills, where streams support diverse aquatic life and are important for local ecosystems.

The plant discharges into small streams that are part of the Oder River basin. These streams flow through the Sudetes mountain range, eventually reaching the Baltic Sea. The watershed supports sensitive aquatic habitats, including spawning grounds for fish and populations of amphibians. The secondary treatment provided helps reduce organic pollution and nutrient loads, protecting downstream water quality and biodiversity.