Vienna's Water Supply to Expand with Danube Island Waterworks by 2030
Vienna's water supply is set to expand with the construction of the Danube Island waterworks, slated to begin in spring 2026. This project, part of the 'Vienna Water 2050' strategy, will ensure supply security amidst increasing demand.
The waterworks will include a treatment plant and UV disinfection, with water sourced from 17 groundwater wells on the Danube Island and in Nußdorf, not directly from the rivers. The facility, expected to be completed by 2030 between the Nordbrücke and the Steinitzsteg, will deliver up to 1,000 liters of drinking water per second.
The 'Vienna Water 2050' strategy also involves expanding the water supply through an additional pipeline from the Höllbach spring and the world's largest closed drinking water reservoir in Neusiedl am Steinfeld. The latter is being implemented by the Austrian company 'Wabag'.
Construction will begin in early October with the reorganization of pedestrian and cycling connections on the island, starting with the towpath on the New Danube side.
With an average water demand forecasted to increase from 400,000 to about 450,000 cubic meters per day by 2050, annual investments in supply security are estimated at around 120 million euros. The Danube Island waterworks project aims to guarantee supply security on peak days, ensuring Vienna's water needs are met.
