The Bristol water network upgrade will see £66 million invested over the next four years to improve infrastructure, reduce supply interruptions and strengthen long-term resilience across the region.
Delivered by Bristol Water, the programme focuses on upgrading pipes, treatment works and reservoirs that support the delivery of drinking water to customers. The investment is designed to ensure a reliable, safe supply while adapting to increasing pressures from climate change and population growth.
Infrastructure upgrades across the Bristol water network
The Bristol water network upgrade includes a wide range of improvements to core infrastructure. Over the next four years, works will include upgrading treatment processes, installing new pipes and replacing ageing assets to reduce leakage and bursts.
Approximately 130 miles of pipe will be replaced, equivalent to the distance between Bristol and Newquay. Water meters will also be upgraded to help customers better understand and manage their usage, while reservoirs will be protected to maintain raw water quality before treatment.
These upgrades are expected to reduce supply interruptions and improve overall system reliability, particularly during periods of high demand or extreme weather conditions.
Modernising water treatment processes
Several major projects are already underway at treatment works as part of the Bristol water network upgrade. At Cheddar Water Treatment Works, a £6.5 million investment is upgrading filtration systems and introducing ultraviolet (UV) treatment to enhance purification without affecting taste.
At Stowey Water Treatment Works, £23 million is being invested in new filtration systems designed to reduce chemical usage while improving efficiency. A further £25 million project at Littleton Water Treatment Works will introduce similar advanced treatment technologies.
These improvements will increase the volume of drinking water that can be treated at any one time, supporting system performance during peak demand periods such as heatwaves.
What the Bristol water network upgrade means for water infrastructure
The Bristol water network upgrade reflects a wider trend across the water sector towards strengthening infrastructure resilience while improving operational efficiency.
Utilities are increasingly investing in modern treatment technologies, including UV disinfection and advanced filtration, to enhance water quality while reducing chemical dependency. These systems provide more consistent treatment performance and can respond more effectively to variations in raw water quality.
At the same time, replacing ageing pipe networks is critical to reducing leakage and improving supply reliability. Older infrastructure is more prone to bursts and inefficiencies, particularly under stress from temperature fluctuations and ground movement linked to climate change.
Reservoir protection is also becoming a greater priority, as maintaining higher raw water quality reduces the treatment burden downstream and supports more sustainable operations.
Protecting reservoirs and supporting water quality
Reservoirs play a central role in maintaining water quality before treatment. As part of the Bristol water network upgrade, £5.75 million is being invested in protecting raw water storage at key sites including Blagdon Lake Tower, Pucklechurch Service Reservoir and Barrow.
Maintaining reservoir integrity helps ensure water arrives at treatment facilities in better condition, reducing the level of processing required and improving overall efficiency.
Richard Stanbrook, General Manager for Drinking Water Services at Bristol Water, said: “Much of the investment we are making in Bristol from 2025-2030 takes place out of sight, so customers understandably want to know how it benefits them.
“These improvements are about protecting the reliability and quality of our water supply. They help ensure water continues to flow as it should, tastes as it should, and remains resilient during periods of extreme weather, both now and for the future.”
Further updates on infrastructure and treatment developments can be found in our Water Treatment section.
