Fagersta Avloppsreningsverk – Municipal Wastewater Treatment in Fagersta, Sweden

Fagersta Avloppsreningsverk is the municipal wastewater treatment plant for the town of Fagersta, located in Västmanlands län, Sweden. The plant serves a population of about 11,330 people, placing it in the medium agglomeration category under the EU Urban Waste Water Treatment Directive (UWWTD). As a Swedish facility, the plant operates under the national implementation of the EU UWWTD, which requires secondary treatment for agglomerations of this size. The plant's treatment processes are designed to meet the effluent standards set by Swedish environmental authorities, ensuring compliance with both national and European water quality regulations. The treated wastewater is discharged into the local watershed, which ultimately drains into the Baltic Sea via the Norrström drainage basin. The Baltic Sea is a sensitive marine environment with limited water exchange, making effective nutrient removal critical to prevent eutrophication. The plant plays a key role in protecting downstream water quality and the ecological health of the region.

The plant discharges into the local water system that flows through the Norrström basin, eventually reaching the Baltic Sea. The Baltic Sea is a brackish, semi-enclosed sea with high ecological sensitivity, particularly to nutrient loading from wastewater. Effective treatment at Fagersta helps reduce the risk of algal blooms and supports the health of aquatic ecosystems in the downstream chain.