Klaranlage Surental - Wastewater Treatment Plant in Triengen, Luzern, Switzerland

Klaranlage Surental is a municipal wastewater treatment plant located in Triengen, within the canton of Luzern, Switzerland. Serving a population of 42,250, it is classified as a medium-sized agglomeration under Swiss and EU standards. The plant is situated in the rural-urban interface of the Surental region, contributing to local water quality management. As a Swiss facility, Klaranlage Surental is subject to the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates advanced treatment standards to protect sensitive water bodies. For agglomerations of this scale, secondary treatment with nutrient removal is typically required, especially in catchments draining into ecologically sensitive areas. The plant's design and operation align with these national requirements, ensuring compliance with stringent effluent limits. The treated wastewater from Klaranlage Surental is discharged into the local watershed, which ultimately drains into the Rhine River basin via the Aare River system. This river network supports diverse aquatic life and provides drinking water for downstream communities. The plant plays a key role in preserving the ecological health of the Surental valley and the larger Rhine ecosystem.

Klaranlage Surental discharges into the Surental watershed, which flows into the Suhre River, a tributary of the Aare River. The Aare joins the Rhine River, which drains into the North Sea. This catchment supports diverse aquatic habitats and is important for migratory fish species. The plant's treatment helps protect downstream water quality in this ecologically sensitive region.