Thames Water investing £400m to improve Coppermills Water Treatment Works
- Thames Water is carrying out a £400m upgrade over the next seven years to improve Coppermills Water Treatment Works in Walthamstow, London.
- The upgrades will improve the site’s capacity to meet the needs of customers, with the site responsible for supplying water to Londoners.
- Work scheduled to begin in spring 2026 and will be completed over seven years.
Thames Water is improving its Coppermills Water Treatment Works, in Walthamstow, through a seven-year £400m investment programme. The site is an integral part of Thames Water’s supply network to London, and this significant upgrade will enhance the site’s efficiency, reliability and ability to serve London’s growing population.
Upgrades include:
• A new high-lift pumping station
• A new slow sand filter recirculation system
• Improved power supply through a new electricity substation
Mark Gelinski, Senior Project Manager at Thames Water said:“Our purpose is to deliver life's essential service, so our customers, communities and the environment can thrive. As custodians of important infrastructure, we need to ensure that our sites are resilient to the pressures of London’s growing population and climate change. Upgrading and investing in our assets is essential to this and this project will mean improved water security for Londoners as we continue to deliver a secure supply of high-quality drinking water for customers across the capital.”
Thames Water are also upgrading Hampton Water Treatment Works to future-proof London’s water supply and the full programme of work is due to finish in 2032.
The work will be carried out by ACCIONA, a global leader in providing regenerative solutions for a decarbonized economy.
More information about the Coppermills project can be found here.