Welsh Water faces £44.7m penalty for wastewater failures

Dŵr Cymru/Welsh Water has been hit with a £44.7 million penalty by Ofwat for failing to properly manage its wastewater treatment works, leading to environmental damage.

Ofwat has confirmed its final decision to formally accept a £44.7m enforceable package of undertakings from Dŵr Cymru/Welsh Water. This closes the seventh case in its sector-wide wastewater investigation and takes the total of resulting enforcement packages and fines across the sector to more than £300m.

Ofwat previously announced on March 12 that the company had failed to operate, maintain and upgrade its wastewater treatment works and networks adequately to ensure that they could cope with the flows of sewage and wastewater.

A consultation period followed where customers and stakeholders provided feedback on the provisional decision.

Having assessed all the responses received, Ofwat has formally accepted the enforcement package which includes redress to customers and the environment including:

Lynn Parker, Senior Director for Enforcement at Ofwat, said: “Our investigation found serious and unacceptable breaches in how Dŵr Cymru Welsh Water has operated its wastewater assets which has resulted in excessive spills to the environment.

“With this investigation now concluded, we expect the company to focus on putting things right so that customers can regain trust in their water company.

“We are playing our part in holding companies to account with this announcement marking the seventh case we have now closed in our sector-wide investigation, taking the total of resulting enforcement packages and fines to more than £300m.”

The company will be required to deliver the redress measures included in its enforcement package during 2025-30. This is investment over and above existing plans the company committed to as part of the 2024 Price Review. These costs will be absorbed by the company and not funded through higher customer bills.

The £44.7m package is greater than the £40m fine that Ofwat would otherwise have imposed as a fine and ensures the money is spent directly on environmental improvements rather than returned to HM Treasury.

Delivery of the package will be monitored by Ofwat, and the undertakings are legally enforceable.

Commenting on the news, Welsh Liberal Democrat Westminster spokesperson David Chadwick MP, said: "These findings confirm what communities across Wales have known for years - Welsh Water has been failing to do its job while rivers, streams and coastlines have paid the price.

"People will be rightly furious that it has taken intervention from Ofwat and a £44.7 million enforcement package to force action on failings that should have been addressed years ago.

“Dŵr Cymru likes to present itself as different from other water companies, yet despite its not-for-profit model, it has still overseen serious wastewater failures, and they have still paid out massive executive bonuses.

"The Welsh Liberal Democrats will continue to push for far stronger regulations, backed by properly resourced enforcement, to ensure polluters are held accountable, and our rivers are properly protected."

A Welsh Water spokesperson said: “We acknowledge the findings of Ofwat’s investigation and apologise for where we have fallen short of the standards that our customers and regulators rightly expect.

“The investigation considered both historic and more recent compliance, and we recognise that improvements are needed. Over the past year, we have already begun a major transformation programme across the business, including our wastewater services, focused on improving governance, strengthening operational oversight, accelerating investment and delivering better outcomes for customers and the environment.

“While we know there is much more to do and that it will take time to get to the level of performance our customers and regulators rightly expect, we are beginning to see early signs of progress in some key areas of performance. During 2025/26, leakage has started to reduce following increased repair activity and progressive metering, customer complaints relating to water quality have reduced following targeted work on our network, and incidents of internal sewer flooding have reduced.

“This £45 million redress package will deliver additional environmental improvements and help reduce the impact of storm overflows.

“As part of this package, £42 million will be invested in reducing spills from specific storm overflows and tackling groundwater entering the sewer network – a major contributor to frequent spills. This will include targeted investment at priority sites, alongside investigations and improvement work to reduce infiltration across parts of the network.

“A further £2 million will support improvements to river habitats, while a new £1 million Cymuned Natur Fund will provide practical support to community groups and charities working to protect and enhance the environment across Wales.

“These commitments are additional to our £4.2 billion investment programme for 2025–2030, including £2.5 billion dedicated to environmental improvements and £889 million specifically targeted at improving storm overflows.

“We are determined to deliver the sustained improvements that our customers, communities and regulators rightly expect, and this work forms an important part of that commitment.”