OPFIKON KLOTEN Wastewater Treatment Plant, Glattbrugg, Zürich, Switzerland

OPFIKON KLOTEN is a wastewater treatment plant located in Glattbrugg, within the Opfikon municipality of the Zürich canton, Switzerland. The facility serves a population of approximately 56,817, placing it in the medium-to-large agglomeration category under the EU Urban Waste Water Treatment Directive (UWWTD). As a Swiss plant, it operates under national regulations that align with EU standards, ensuring effective treatment to protect water quality. Under Swiss and EU regulations, plants serving over 50,000 people are typically required to implement secondary treatment, with tertiary treatment in sensitive areas. The facility's location in the densely populated Zürich region suggests it plays a key role in managing urban wastewater. The treated effluent is discharged into the local water system, which ultimately drains into the Rhine River basin via the Glatt River. The Rhine is a major European waterway supporting diverse aquatic life and providing drinking water for millions. The plant's operations help maintain water quality in this ecologically significant river system, contributing to the health of downstream environments including Lake Constance and the North Sea.

The plant discharges into the Glatt River, a tributary of the Rhine River. The Rhine basin is a critical ecological corridor supporting diverse fish species, including salmon and eel, and provides drinking water for millions. The plant's treatment helps protect downstream water quality in Lake Constance and the North Sea, reducing nutrient loading and safeguarding aquatic habitats.