Water and Sewer

Stockholm’s water and wastewater management is efficient, but there is room for further improvement. Resources in wastewater, such as energy, water, and nutrients, should be managed in a more circular manner, for example through source separation. Treated greywater could replace potable water and extracted nutrients could substitute artificial fertilisers in managing the city’s green infrastructure. Waste heat and biogas are vital resources in an optimised energy system.

2023 Highlight:

Innovative water usage

In 2023, the potential for replacing potable water with treated greywater was explored as part of the “Grey Becomes Blue” innovation project, funded by the Stockholm County Administrative Board. The project offers considerable potential for the use of greywater for irrigation and in local industries.

Conditions for source-separating wastewater systems in Värtahamnen and Loudden were investigated in collaboration with Stockholm Vatten och Avfall, and the results indicate positive societal benefits such as reduced environmental and health impacts. Stockholm also participates in the “Anchor” innovation project, where experiences from five pilot projects with source-separating water systems in various countries are compiled and evaluated.

Experiences from Stockholm Royal Seaport are now being applied in another development project, Skarpa By in southern Stockholm.

Water is used in construction sheds and at construction sites. In City of Stockholm construction contracts, most water was used for lime-cement stabilisation and tunnel construction.

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