SIA Islices udens Wastewater Treatment Plant, Īslīces pagasts, Latvia

SIA Islices udens is a wastewater treatment plant located in Īslīces pagasts, Bauskas novads, Latvia. The facility serves a population of approximately 1,214 people, classifying it as a small agglomeration under EU standards. It is situated in the rural landscape of the Bauska region, near the border with Lithuania. The plant provides secondary treatment, which is the minimum required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. The designed capacity is 2,000 m³/day, and the current discharge volume is 343.44 m³/day, indicating operational headroom. As a municipal facility, it is subject to Latvian national regulations that implement the EU directive. The treated effluent is discharged into local watercourses that eventually drain into the Lielupe River basin, which flows into the Baltic Sea. The plant plays a key role in protecting the region's surface waters from nutrient pollution, supporting aquatic life and downstream ecosystems.

The plant discharges into the Lielupe River basin, which flows through central Latvia and empties into the Baltic Sea near Riga. The Lielupe is an important river for local biodiversity, supporting fish species and migratory birds. The Baltic Sea is a sensitive brackish water body prone to eutrophication, making nutrient removal from wastewater critical for marine health.