Water companies will have to pay a £157.6 million penalty after missing key targets on reducing pollution, leaks and supply interruptions while customer satisfaction continues to fall, Ofwat has said.

In an annual performance report on water firms, Ofwat said customer bills will be slashed in 2025-6 to reflect the penalties, with the total rebates calculated in December.

Not one company achieved the regulator’s top category of “leading” while Anglian Water, Welsh Water and Southern Water fell into the lowest category of “lagging” while the remaining 10 were rated “average”.

Ofwat judges the performance of water companies in England and Wales each year against the “stretching” targets they set in 2019 for a five-year period until 2025.

If they fail to meet these, Ofwat restricts the amount of money they can take from customers. Ofwat said the figures are provisional until it completes a review process.

Despite water companies committing to reduce pollution incidents by 30%, there has only been a 2% reduction.

And companies are falling further behind on key targets for pollution and internal sewer flooding, the regulator added.

David Black, chief executive of Ofwat, said: “This year’s performance report is stark evidence that money alone will not bring the sustained improvements that customers rightly expect.

“It is clear that companies need to change and that has to start with addressing issues of culture and leadership. Too often we hear that weather, third parties or external factors are blamed for shortcomings.

“Companies must implement actions now to improve performance, be more dynamic, agile and on the front foot of issues. And not wait until the Government or regulators tell them to act.

“As we look towards the next price control, the challenge for water companies is to match the investment with the changes in company culture and performance that are essential to deliver lasting change.”

Thames Water moved up a category from “lagging” to “average” as it met some performance targets on leakage and supply interruptions.

Despite this, the heavily indebted London water provider will have to pay £56.8 million, the biggest fine for the fourth straight year.

Anglian Water’s fine is £38.1 million, Yorkshire Water’s is £36 million and United Utilities’ penalty is £33.2 million.

The penalties are separate to an ongoing Ofwat investigation into all 11 of England and Wales’s water firms, which ordered three companies to pay £168 million in fines in August, in the first results of the probe.

It comes against a backdrop of mounting public and political fury at the privatised water sector which is under fire over sewage spills, proposed bill rises and executive bonuses.

Years of under-investment by the privately-run firms combined with ageing water infrastructure, a growing population and more extreme weather caused by climate change have seen the quality of England’s rivers, lakes and oceans plummet in recent years.

Some water utilities are also creaking under high levels of debt or face criticism over dividends to shareholders and executive bonuses.

Labour has said it wants the sector to reduce spills and has even proposed sweeping new laws which could see bosses face up to two years in jail if they obstruct regulators.

Steve Reed, Secretary of State for the Environment, Food and Rural Affairs, said: “Our waterways should be a source of national pride, but years of pollution and underinvestment have left them in a perilous state.

“The public deserves better. That’s why we are placing water companies under special measures through the Water Bill, which will strengthen regulation including new powers to ban the payment of bonuses for polluting water bosses and bring criminal charges against persistent law breakers.

“We will be carrying out a full review of the water sector to shape further legislation that will fundamentally transform how our entire water system works and clean up our rivers, lakes and seas for good.”

On Monday, a report from the Environment Agency found that almost a fifth of water supplies are being lost through leaks before they reach customers’ taps.

James Wallace, CEO of campaign group River Action, said: “This might sound like a lot of money but frankly it is a drop in the ocean for polluting water companies that have handed billions in dividends and interest payments to investors.

“Clean and abundant water and healthy ecosystems are fundamental to human life and our economy.

“Yet, water companies continue to pollute the nation’s waterways without facing the full force of the law or sufficient penalties.”

Mike Keil, chief executive of the Consumer Council for Water (CCW), added: “Poor performance on pollution incidents and a failure to protect thousands of households from the misery of sewer flooding will do little to reverse the unprecedented decline in people’s satisfaction and trust in water companies, which is reflected in our research.

“Customers will rightly question why some companies should be trusted with more of their money for future investment, when they are struggling to deliver on their existing commitments.

“People need to see and experience changes which convince them the industry cares as much about the environment as they do.”