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UK water bills to rise as regulator green lights $4.6 billion in extra spending - Finance news and analysis from Global Banking & Finance Review
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UK water bills to rise as regulator green lights $4.6 billion in extra spending

Published by Global Banking & Finance Review

Posted on August 13, 2026

3 min read

· Last updated: August 13, 2026

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UK Water Bills Set to Increase as Regulator Approves £3.4bn in Extra Spending

Regulator Ofwat Approves Bill Increases and Infrastructure Spending

By Prerna Bedi

Aug 13 (Reuters) - Five British water companies will be allowed to raise customer bills after regulator Ofwat on Thursday provisionally approved up to £3.4 billion ($4.59 billion) of additional spending on infrastructure and environmental measures.

The package would help utilities to remove so-called forever chemicals and improve drinking water quality, Ofwat said in a statement, and would support housebuilding and data centre development.

Britain's water industry has come under intense scrutiny and faces an overhaul to fix environmental breaches, soaring debt levels, high dividend payouts and rising customer bills.

Government Response to Water Industry Challenges

"I know that households across the country are watching every pound and I share their frustration that years of underinvestment and toothless regulation has led to this," Environment Secretary Angela Eagle said.

Impact on Customers: Bill Increases by Region

Southern Water Customers to See the Biggest Rise in Bills

Five of the 13 companies which have received the approvals have been allowed to increase customer bills between 2027 and 2030, including Thames Water, Severn Trent, Southern Water, and Wessex Water.

Details of Southern Water's Bill Increases

Southern Water, with over 4 million consumers across Britain, will see the largest bill increase. They will rise by £43 for 2027-28 and £37 for 2029-2030.

"The additional funding reflects unavoidable increased costs and is needed if we’re to meet strict obligations to protect the environment and secure the long-term water supplies the population needs," a spokesperson for Southern Water said.

Thames Water and Other Utilities

Britain's largest utility Thames Water, which is struggling to avoid a collapse, will be allowed to raise bills by £3 for 2027-28 and by £5 for 2029-2030.   

"This funding will allow us to continue to develop vital water security projects, which will keep the taps flowing for millions of customers across London and the South East," a Thames Water spokesperson said in a statement. 

Oversight and Future Decisions

'Expenditure Can Be Clawed Back'

"We will track performance to ensure companies are delivering the expected improvements for customers and the environment," said Ofwat Executive Director for Delivery Helen Campbell. "If they don't, expenditure can be clawed back." 

Investment in Infrastructure and Data Centres

Ofwat said £477 million of the additional funding will be used to address rising demand linked to housebuilding and data centre development.

United Utilities, which plans to invest in water infrastructure for data centres in east Manchester, received the highest approval of £995 million, compared with the £1.11 billion it had requested.

Timeline for Final Decision

Ofwat will make its final decision in December. 

($1 = 0.7410 pounds)

(Reporting by Prerna Bedi in Bengaluru; Additional reporting by Muvija M, Anushka Chourasia and Nithyashree R B; Editing by Mrigank Dhaniwala, Sherry Jacob-Phillips and Jan Harvey)

Key Takeaways

  • Ofwat’s green light allows five companies, including Southern Water, Thames Water, United Utilities, Severn Trent, and Wessex Water, to raise customer bills to fund investment in removing 'forever chemicals', boosting drinking water quality, supporting housing and data center growth, and addressing long-underfunded infrastructure and environmental breaches. (ofwat.gov.uk)
  • Southern Water faces the largest increases—£43 in 2027–28 and £37 in 2029–30 per customer—whereas Thames Water, battling financial instability, is allowed more modest hikes of £3 and £5 respectively in the same periods; United Utilities received the highest individual allowance (£995 million), though slightly less than requested, to upgrade water infrastructure in east Manchester. (reddit.com)
  • These provisional approvals contribute to a broader £104 billion investment plan for 2025–2030, which includes rollout of 10 million smart meters and major infrastructure upgrades; Ofwat will monitor performance closely and can claw back funds if promised improvements aren't delivered. (ofwat.gov.uk)

References

Frequently Asked Questions

Why are UK water bills increasing?
Bills are rising after Ofwat approved up to £3.4 billion in extra spending for water infrastructure and environmental measures.
Which water company will see the largest bill increase?
Southern Water customers will see the biggest rise, with an increase of £43 for 2027-28 and £37 for 2029-2030.
How will the extra funding be used?
The funding will remove forever chemicals, improve water quality, and support infrastructure for housebuilding and data centres.
Can approved spending be reversed?
Yes, Ofwat stated that if performance targets are not met, some of the approved expenditure can be clawed back.
When will Ofwat make its final decision?
Ofwat will make its final decision on the additional spending in December.

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