Details of principal operating subsidiary undertakings and joint ventures are set out below. These undertakings are included within the consolidated financial statements. A full list of the group's subsidiary undertakings is included in the company's annual return.

Class of share
capital held
Proportion of
share capital
rights %*
Nature of business
Subsidiary undertaking
Great Britain
United Utilities Water Limited
(formerly United Utilities Water PLC)
Ordinary100.0Water and wastewater services and network management
United Utilities Property Services LimitedOrdinary100.0Property management
Joint ventures
AS Tallinna VesiOrdinary35.3Contract operations and maintenance services

* Shares are held by subsidiary undertakings rather than directly by United Utilities Group PLC.