Berlin

City Water System

Berlin’s water system is organised around regional groundwater, bank filtration, nine waterworks and a large metropolitan distribution and sewer estate. Drinking-water supply, wastewater treatment, stormwater management and receiving-water quality are connected through the Spree–Havel–groundwater system. This makes source conditions and regional river flows material to city resilience even when installed treatment capacity appears ample. Berliner Wasserbetriebe is the principal public operator, while the Berlin Senate shapes ownership, regulation, urban planning and long-term investment priorities.

Resources & Supply

The city’s drinking water is drawn entirely from regional groundwater, with bank filtration supporting recharge and source availability. Annual water sales were 217 million cubic metres in 2025, against reported waterworks capacity of 1.1 million cubic metres per day. The strategic question is therefore not capacity alone, but dependable yield as drought, groundwater conditions and changes to dry-season River Spree flows alter the resource balance. Network renewal, deeper wells, reactivated waterworks, demand measures and a monitoring estate of more than 2,500 observation pipes form the current response.

Wastewater & Stormwater

Six operated wastewater treatment facilities serve Berlin and surrounding communities. The sewer estate includes 1,928 kilometres of combined sewers alongside separate foul-water and rainwater systems, so intense rainfall creates a distinct overflow and drainage challenge rather than simply a treatment-volume problem. Advanced treatment at Schönerlinde, sludge-processing investment and phosphorus recovery strengthen environmental performance. The Rainwater Agency and blue-green infrastructure programmes extend the response into local retention, infiltration and evaporation across the urban landscape.

Investment & Resilience

Berlin’s current programme combines network rehabilitation, advanced wastewater treatment, sludge utilisation, source resilience and stormwater adaptation. Berliner Wasserbetriebe invested €589.0 million in fixed assets excluding financial assets in 2025, including €184.9 million in treatment works. Annual investment, contracted multi-year obligations and individual project values are kept separate. The delivery test is whether this capital programme improves resource security, service continuity, receiving-water quality and resilience while remaining affordable under public ownership.

Key Challenges

1. Protecting dependable groundwater supply as drought and regional River Spree conditions change.
2. Renewing extensive water and sewer networks while maintaining service across a dense city.
3. Reducing combined-sewer overflows and managing more intense rainfall through conventional and blue-green infrastructure.
4. Delivering advanced treatment and circular recovery without obscuring project maturity, cost or measurable outcomes.

Connected Intelligence