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Thames Water invests £93.1 million to secure water supply in Guildford

  • Thames Water invests £93.1 million to secure water supply in Guildford
  • Thames Water is investing over £93 million (more than €106 million) to ensure future secure water supply for its Guildford customers.  
  • This includes multi-million-pound upgrades at its Shalford, Netley Mill, Ladymead and Mousehill  water treatment sites. 
  • In 2024 work will also begin to build a new 9 km water transfer pipeline which will keep taps flowing for 9,000 homes.

About the entity

Thames Water
Every day, we serve 15 million customers across London and the Thames Valley.

Thames Water is carrying out several multi-million-pound upgrades across the Guildford area to ensure a safe and secure water supply for its customers. The area currently operates as an ‘island’ water supply zone, supplied directly from nearby reservoirs and water treatment works.  

This creates challenges if there are issues onsite and means there isn’t a back-up supply for its customers. To build greater resilience the company is upgrading sites and building new infrastructure to address this challenge.  

In early 2024, work will begin to build a new 9 km water pipeline, which will transfer up to 14 megalitres of water per day, equivalent to almost six Olympic swimming pools, between Pewley Reservoir in West Guildford to Netley Mills water treatment works in East Guildford. 

The project is expected to complete in time for winter 2025 and will provide greater resilience against supply interruptions for around 9,000 homes in East Guildford.  

Currently, East Guilford is supplied by a single source at the Netley Mill water treatment works. The new pipeline will ensure East Guildford benefits from a back-up source, helping prevent future supply interruptions across the local area. 

Paul Wetton, Director of Water for Thames Valley and the Home Counties, Thames Water said: “We’re committed to providing a secure and reliable water supply to all our customers, especially those in Guildford who have been impacted by recent water outages.  

“As part of our strategy to turnaround our business and deliver better for our customers we are investing over £93 million [more than 106 million] to build resilience across the area and keep the taps flowing for our customers, starting with a new 9 km water transfer pipe between west and east Guildford.  

“We’re inviting customers and communities to find out more about the planned water transfer pipe and are hosting two events this week.” 

Community events to discover more about Guildford’s West to East transfer pipe will be held on Thursday 23 November at St Marys Church, 59 Quarry Street, Guildford, GU1 3UA (4pm to 8pm), and on Saturday 25 November at Chilworth Village Hall, New Road, Chilworth, GU4 8LZ (11:30am to 5pm).

This investment forms part of Thames Water’s wider plans to improve infrastructure across Guildford, including upgrades to water treatment sites at Netley Mill, Shalford, Mousehill and Lady Mead.  

The upgrades will reduce supply interruptions and make the sites more resilient. Investment at Mousehill water treatment works will also increase the amount of water available. The total amount invested spans both the current and next business period, which run-in five-year cycles. 

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