Zimmerberg region consolidates wastewater treatment in new plant
The construction company STRABAG is building the shell for the new Zimmerberg wastewater treatment plant. The new pumping station in Thalwil is scheduled to go into operation in 2029 and will serve up to 78,000 residents and industry.
STRABAG AG is involved in the Zimmerberg wastewater treatment plant (WWTP) project. The Schlieren-based construction company is erecting the shell of the new Scheller pumping station in Horgen on the former Gasi site. According to a statement, the aim of this work is to replace the existing WWTPs in Horgen and Thalwil with a new plant.
Both existing wastewater treatment plants are “getting on in years”. Instead of operating both pumping stations individually, which would involve high investment costs for comprehensive modernisation, both municipalities have decided to join forces and create a “joint, modern wastewater treatment plant” for the Zimmerberg region. Once the joint treatment plant is operational, the existing Horgen wastewater treatment plant will be dismantled. The resulting unused land on the lake shore will be made available for public use and urban development.
The participating municipalities of Horgen, Oberrieden, Rüschlikon and Thalwil already joined forces in September 2020 to form the ARA Zimmerberg special-purpose association. ARA Zimmerberg expects that from 2029 onwards, it will be able to treat the wastewater of up to 78,000 residents and industry in the Zimmerberg region.