Welsh Water handed £44.7m ‘enforcement package’ over sewage failures
Welsh Water will pay out £44.7 million after failures in its sewage network and oversight led to a series of spills and must now focus on “putting things right”, regulator Ofwat has announced.
The package, which is legally enforceable, closes the seventh case in Ofwat’s sector-wide wastewater investigation and takes the total of resulting enforcement packages and fines across the water industry to more than £300 million.
Ofwat announced in March that Welsh Water had failed to operate, maintain and upgrade its wastewater treatment works and networks adequately enough to cope with flows of sewage and wastewater.
Of the £44.7 million, £40.6 million will go towards addressing harm and reducing spills at specific overflows, along with sealing works on private parts of the sewer network to tackle groundwater getting into the system, which the regulator identified as a significant contributor to overflows that spill frequently.
A further £4.1 million will be invested to improve water quality and biodiversity in sensitive catchments.
Welsh Water has confirmed the costs will be absorbed by the company and will not be added to customer bills.
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.
“This £45 million redress package will deliver additional environmental improvements and help reduce the impact of storm overflows.
“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.”
The package is greater than the £40 million fine Ofwat would otherwise have imposed, equivalent to 7.5% of Welsh Water’s annual turnover, with the difference being that the money will be spent directly on environmental improvements rather than returned to HM Treasury.
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.”
Welsh Water serves customers across north Wales, including Flintshire, and the enforcement comes as the company published its annual results, showing it invested £617 million in its water and wastewater network during 2025–26.
That included £134 million on environmental improvements, £85 million on leakage reduction and £35 million to replace older pipes and improve drinking water quality.
Despite the investment, Welsh Water acknowledged its performance remains below the standards customers expect in a number of areas.
The company is currently rated 2 stars out of a possible 4 by Natural Resources Wales for environmental performance, and remains in Ofwat’s “lagging company” category.
Welsh Water customers in Flintshire and across Wales have seen their average household bill rise by 4.8% this year, from £652 to £683.
The company said around 150,000 customers currently receive support through social tariffs and assistance schemes.
Delivery of the enforcement package will be monitored by Ofwat through to 2030.
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