Five major water companies have been given provisional approval to increase customer bills after regulator Ofwat authorised up to £3.4 billion in additional investment for infrastructure
and environmental improvements.
Households across parts of Britain are facing higher water bills after Ofwat provisionally approved a multibillion-pound spending package designed to tackle pollution, improve drinking-water quality and strengthen the country's ageing water infrastructure.
The regulator said on Thursday that the additional funding — worth around $4.6 billion — would allow companies to respond to emerging challenges, including the removal of so-called "forever chemicals", while also supporting new housing and the expansion of data centres.
The decision comes as Britain's water industry faces mounting political and public pressure over sewage pollution, environmental failures, heavy debt burdens, dividend payments and years of inadequate investment.
Environment Secretary Angela Eagle acknowledged the frustration felt by households already struggling with rising costs, saying years of underinvestment and weak regulation had left customers paying the price.
Southern Water customers face the sharpest increase
Of the 13 companies covered by Ofwat's latest decisions, five will be permitted to raise household bills between 2027 and 2030.
They include Thames Water, Severn Trent, Southern Water and Wessex Water.
Southern Water customers are set to face the largest increase. Bills will rise by £43 in 2027-28, followed by a further £37 increase in 2029-30.
The scale of the increase is likely to intensify scrutiny of the company as consumers continue to demand better service and stronger environmental performance.
Thames Water, Britain's largest water utility and a company facing serious financial pressures, will receive approval for more modest increases: £3 in 2027-28 and another £5 in 2029-30.
The company said the additional funding would support projects aimed at strengthening water security for millions of customers in London and south-east England.
Regulator warns companies could lose funding
Ofwat stressed that the additional spending will not come without conditions.
The regulator said it would closely monitor whether companies deliver the improvements promised to customers and the environment. Where investment fails to produce the expected results, Ofwat said it could recover the money.
Helen Campbell, Ofwat's executive director for delivery, said the regulator would track companies' performance and could "claw back" expenditure if commitments were not met.
Of the newly approved funding, £477 million has been earmarked for infrastructure needed to meet rising demand associated with housebuilding and the rapid expansion of data centres.
United Utilities received the largest allocation, with Ofwat approving £995 million of additional spending, slightly below the £1.11 billion requested by the company.
The utility plans to invest in water infrastructure supporting data-centre development in east Manchester, reflecting the growing pressure that Britain's digital economy is placing on existing utility networks.
Final decision due in December
Ofwat's latest announcement remains provisional. The regulator is expected to publish its final decision in December.
The outcome will be closely watched as ministers attempt to balance competing pressures: securing billions of pounds of investment in an ageing water system while preventing households from being hit by unaffordable increases.
For Britain's water companies, the message is clear — additional investment will be available, but customers and regulators will expect visible improvements in return. Photo by José Manuel Suárez, Wikimedia commons.
