Zurich Upgrades Water Supply for 1 Million as Demand Rises Through 2040

Zurich unveiled its General Water Supply Project on August 13, confirming that drinking water production capacity will meet demand through 2040 for one million residents across the city and 67 partner communities. However, the strategic plan reveals that aging pipes and infrastructure must be renewed urgently. Rising population, increased consumption peaks, and climate change make infrastructure investment critical to maintain supply during heat waves and droughts.

Lake Zurich remains the backbone of supply

Lake Zurich provides approximately 70 percent of the city’s drinking water, drawn from a depth of 35 meters. Zurich’s city councillor Michael Baumer called the lake an extremely safe reservoir that carries substantial water even during hot summers. Authorities examined whether an independent groundwater resource in the city’s north should be developed as backup. A risk analysis concluded that complete failure of Lake Zurich as a drinking water source is extremely unlikely, and developing an alternative would not be financially viable.

Water demand expected to rise moderately

After years of flat or declining consumption, Zurich expects moderate growth in water use through 2040. The primary drivers are population growth and increased urban density in the city and region. Average daily consumption is projected at roughly 190,000 cubic meters by 2040, with peak daily demand reaching approximately 300,000 cubic meters. Peak consumption is expected to increase particularly sharply.

Infrastructure renewal becomes the urgent priority

While production capacity is sufficient, the city must systematically renew pipes, reservoirs, and treatment works to handle future demand and climate shocks. The infrastructure must be renewed on schedule to ensure supply during heat waves, droughts, and technical failures. The General Water Supply Project (GWP 2025) sets strategic development through 2040 and provides an outlook to 2070, serving as the foundation for future investment planning.

Heat and drought drive planning urgency

This summer, heat and drought have focused attention on water security across Switzerland. Many Zurich canton communities have urged residents to conserve water. The masterplan addresses climate risks by strengthening the regional supply system. The plan ensures that Zurich can maintain clean drinking water supply in both normal operations and emergency situations, even as consumption rises and climate volatility increases.

Final Thoughts

Zurich’s water supply is secure through 2040, but the city faces a capital-intensive infrastructure renewal challenge. Investors and residents should monitor how the canton funds this multi-decade upgrade while managing rising demand.

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