Green-Roofed Waternet Building Recycles Water for the Entire City of Amsterdam

Built on stilts on the banks of the Amstel River outside of Amsterdam, the Waternet Head Office is a dual-tiered building that provides for 100% of the Dutch capital's water needs. Designed by Architectuurstudio Herman Hertzberger, the building holds open plan offices, a restaurant, a congress hall and a café. Waternet is the only institution in the Netherlands concerned with the entire natural water cycle (from rainwater to surface water, and groundwater), and it provides the entire city of Amsterdam with fresh, purified H2O.

Waternet‘s defining architectural features include two bridges on the 8th and 9th stories that link the towers. A luscious green roof tops some of the project’s lower rooms, providing insulation, a verdant entryway for people, and a great environment for insects and wild flowers.

Built on stilts, the Waternet Head Office is surrounding by water, which is recycled for the building’s own use and for the whole of Amsterdam. In addition to purifying water, the company ensures that water levels remain stable in rivers and channels and it takes measures to prevent floods. Inside, the flexible open workplaces provide social spaces to debate the best possible future for Amsterdam’s people and water resources.


This small building does not 'recycle water for the entire city of Amsterdam'.

Like the rest of the western Netherlands, Amsterdam's tap water is almost all derived from river water: water from the Rhine and the Maas is filtered, oxygenated, chemically flocculated, refiltered, UV-irradiated, filtered again, and chemically pH-adjusted.

More specifically- oxygenated meaning O^3 or as it is commonly known as 'ozone'.