Thames, Yorkshire and Northumbrian Water will be fined a record £168m between them for a “catalogue of failure” over illegal sewage discharges into rivers and the sea after the industry regulator’s biggest ever investigation.
The water regulator for England and Wales, Ofwat, has proposed penalties of £104m for Thames, £47m for Yorkshire and £17m for Northumbrian for failing to manage their wastewater treatment works and networks, including their operation of storm overflows. It said it was the first of more crackdowns to come.
Ofwat found all three companies had “routinely” released sewage into rivers and seas, failing to ensure that discharges of sewage from storm overflows occur only in exceptional circumstances, which had “resulted in harm to the environment and their customers”.
The investigation was prompted by a public outcry over water companies breaking legal rules on when they could release raw sewage and came after evidence was presented to MPs that suggested illegal dumping was 10 times higher than the regulators realised.
In 2023, sewage spills in England increased by 54% from the previous year, according to the Environment Agency, with some people are refusing to pay their water bills in response to the sewage crisis.
Steve Reed, the environment secretary, welcomed Ofwat’s action. “The unacceptable destruction of our waterways should never have been allowed – and it is right that those responsible for illegally polluting our rivers, lakes and seas face the consequences,” he said.
He added that the government would fundamentally reform the water sector, announcing first steps to clean up the industry in its special measures bill, to cut sewage pollution, protect customers and attract investment to upgrade its crumbling infrastructure, as well as promising further legislation.
High levels of illegal sewage discharges correlated with treatment works which had not been properly upgraded or maintained by the water companies. Nearly 70% of Thames’s treatment plants had operational problems, Ofwat said, and 16% of its storm overflows were operating in breach of their permits and therefore illegally. At Yorkshire, 16% of sewage works had operational problems and 45% of its storm overflows were were in breach of their permits.
Ofwat also found a strong correlation between high spill levels and operational issues at wastewater treatment sites; a failure to upgrade assets; and said companies had been “slow to understand the scope of their obligations relating to limiting pollution from storm overflows and failed to ensure that they had in place the necessary information, processes and oversight”.
Its chief executive, David Black, said: “Our investigation has shown how [the three companies] routinely released sewage into our rivers and seas, rather than ensuring that this only happens in exceptional circumstances as the law intends.
“The level of penalties we intend to impose signals both the severity of the failings and our determination to take action to ensure water companies do more to deliver cleaner rivers and seas. These companies need to move at pace to put things right and meet their obligations to protect customers and the environment.”
Last month Ofwat proposed that all water companies could raise bills by an average of £94 over five years to an average of £535 a year, described as “a bitter pill” by the chancellor, Rachel Reeves, that reflected “14 years of failure from the Conservatives”.
Under the proposals, companies are required to reduce spills from sewage overflows by 44% by 2030 compared with 2021 levels. Campaigners have criticised the plans, arguing that they do not go far enough to tackle sewage spills, and make customers pay twice.
Thames’s latest financial report showed the number of incidents of pollution from treatment works and the pipe network increased to 350 last year, from 331 in 2022. The rise was attributed to delays in investment to create more capacity at many of the company’s 400 ageing sewage treatment works.
after newsletter promotion
Charles Watson, the chair and founder of the campaign group River Action, said: “Last year sewage was discharged across England, Northern Ireland, Scotland and Wales more than 596,666 times. That’s over 1,600 times a day – and with many of these discharges being illegal, this situation is completely unacceptable.
“Thankfully the water regulator, for so long toothless, is finally waking up to the scale of the public’s outrage and we are starting to see some meaningful penalties being imposed upon the worst offenders.
“However, remember that the water industry was able to find more than £11bn to hand out to their shareholders in dividends last year, which gives context to these fines. Until the ability of these polluting companies to hand out so much cash is severely curtailed, pollution will continue to be a highly profitable activity.”
Thames Water said: “We take this matter very seriously and have cooperated at every stage of Ofwat’s investigation. We regard all untreated discharges as unacceptable, even when they are permitted, and are taking action to improve the health of our rivers as a key area of focus and investment.”
A Yorkshire Water spokesperson said: “We take our responsibility to protect the environment very seriously. Last year, we apologised for not acting quickly enough and announced our £180m programme to reduce discharges from our storm overflows before April 2025.
“We are disappointed with Ofwat’s response to their investigation into our wastewater treatment networks.” Yorkshire said it had more robust processes and procedures in place, and had finished work at 10 storm overflows with 44 on site, and 66 due to start soon.
Northumbrian Water was approached for comment.
