A severe water main rupture in Molesey left up to 15,000 properties across south London and Surrey without water or experiencing low pressure on September 28, 2026. The incident forced multiple schools to close for the day. The emergency began around 5:15 AM after a major pipe burst, leaking 750 liters of water per second and flooding local areas, including parts of the Wilderness in Molesey.
Thames Water isolated the damaged main and rerouted network supplies, reducing the number of affected properties to roughly 6,000 by Monday afternoon. Several educational institutions had to shut down due to the sudden supply failure, disrupting thousands of students and local families.
Impacted Schools and Affected Postcodes
The sudden loss of water pressure and supply caused significant disruption to daily routines, prompting closures at several schools and colleges across the region. Institutions that shut their doors for the day included:
- Esher College (Esher Sixth Form College)
- Kingston Grammar School
- Holy Cross School in New Malden
- Long Ditton Infant and Nursery School
- Thames Ditton Infant School
- Hollyfield School and Sixth-Form Centre in Surbiton
Thames Water confirmed that customers across multiple postal districts experienced supply issues. The affected postcodes included CR4, KT1, KT10, KT12, KT2, KT3, KT5, KT6, KT7, KT8, SM4, SW16, SW17, SW18, SW19, SW20, TW10, and TW16.
Response from Thames Water and Local MPs
As repair crews worked around the clock on site, Thames Water issued an apology for the severe disruption and deployed specialist teams to manage the structural damage.
“Our specialist team is now on site and working to stop the water flooding from the broken pipe,” a Thames Water spokesperson said. “We have isolated the burst main in Molesey and all customers should see their water supply restored shortly if it has not been already, although they may experience some low pressure.”
The company confirmed that a bottled water station was opened at Sandown Park Racecourse on Portsmouth Road. Emergency water deliveries were prioritized for vulnerable customers registered on their priority services list.
Local politicians voiced strong frustrations over the incident. Monica Harding, Liberal Democrat MP for Esher and Walton, called for an urgent investigation into the state of local utilities. “My worry is that decades of underinvestment in our infrastructure and poor regulation may be causing incidences like this,” Harding stated. Sir Ed Davey, MP for Kingston and Surbiton and leader of the Liberal Democrats, also criticized the utility provider. He argued that the disruption highlights systemic failures within the company’s network operations.
Infrastructure Concerns and Recovery Efforts
The major leak reignited broader debates surrounding the stability of the UK water network. It arrived amid ongoing discussions regarding Thames Water’s massive debt load and potential special administration models proposed by government committees.
While engineers continued permanent repairs at the Molesey site, local businesses and residents relied on emergency supplies. Helen Ryder, a florist in Thames Ditton, noted the delicate balance of managing stock during the outage: “Our priority is to make sure staff have water, but we need to make sure the flowers do too.”
Thames Water advised residents that full normal water pressure would return to remaining affected sectors once the permanent structural fixes to the broken main were fully completed.
