A major programme to replace ageing water mains on the Isle of Wight is under way, as utility companies step up investment to reduce leaks and improve supply resilience.
Southern Water said it is investing more than £5m to replace around 11km of pipes across the island over the next 18 months. The work is aimed at reducing bursts and emergency repairs, as well as cutting leakage and supply interruptions for customers.
Many of the existing pipes are made of cast iron and date back more than a century, with some sections installed as early as 1866. While they have been maintained over time, the company says their age means they are increasingly prone to failure. They are being replaced with modern plastic pipes designed to be more durable and reliable.
Construction began in August and more than 2km of mains have already been upgraded. A second phase of the programme is under way in Cowes, where engineers are replacing 1.8km of pipe in Rew Street. Southern Water said this is the longest single mains replacement project ever undertaken on the island and is due to be completed by January 2026.
Elsewhere, work has started on the A3054 between Shalfleet and Ningwood Hill, with two-way traffic lights currently in place. This section of the upgrade is expected to finish by mid-December. Further works are planned for early 2026 in Fishbourne, including on Horsebridge Hill and Elenors Grove, where road closures and traffic management will be required.
Southern Water said it has briefed local councillors and is writing to affected residents and businesses ahead of the next phase. Public drop-in events are also planned to explain the programme and its likely impact.
