LENZBURG Wastewater Treatment Plant, Möriken AG, Aargau, Switzerland

LENZBURG is a wastewater treatment plant located in Möriken AG, within the Bezirk Lenzburg district of Aargau, Switzerland. The facility serves a population of around 62,817, placing it in the medium-to-large agglomeration category for Swiss wastewater infrastructure. Its location in the Aare River watershed positions it within a region known for its stringent environmental standards. As a Swiss plant, LENZBURG is subject to the Federal Water Protection Act (Gewässerschutzgesetz), which mandates advanced treatment to protect sensitive water bodies. For agglomerations of this scale, secondary treatment with nutrient removal (nitrogen and phosphorus) is typically required to meet the high water quality standards of Swiss rivers and lakes. The plant's design and operational practices align with these national regulations, ensuring effective pollutant removal before discharge. The treated effluent from LENZBURG is discharged into the Aare River, a major tributary of the Rhine River. The Aare flows through the Swiss Plateau and ultimately drains into the North Sea via the Rhine. This downstream water body supports diverse aquatic life, including fish species such as brown trout and grayling, and is an important corridor for migratory fish. The plant's treatment performance is critical to maintaining the ecological health of the Aare and the broader Rhine basin.

LENZBURG discharges treated wastewater into the Aare River, which flows through the Swiss Plateau and joins the Rhine River near Koblenz, Switzerland. The Rhine then drains into the North Sea. The Aare supports a diverse aquatic ecosystem, including fish species like brown trout and grayling, and serves as a migratory corridor. The plant's location in a densely populated area of Aargau requires advanced treatment to protect downstream water quality and ecological balance.