Water companies across England and Wales face tougher scrutiny after regulators recorded 2,991 pollution incidents during 2025, including 84 classified as serious, prompting ministers to promise further action against persistently underperforming firms.
The figures were published on Thursday 29 October 2026 in the first joint Water Industry Performance Insights report, bringing together evidence from the Environment Agency, Ofwat, Natural Resources Wales and the Drinking Water Inspectorate.
The findings show continuing problems with pollution, delayed environmental improvements and customer satisfaction, despite progress in drinking water quality and sewer flooding prevention.
Four water companies face executive bonus restrictions
Southern Water, Thames Water, South West Water and Yorkshire Water received one-star environmental ratings, automatically triggering executive bonus restrictions under rules introduced in 2025. The Government says the existing restrictions will affect six chief executives when the relevant serious pollution incidents are also taken into account.
Environment Secretary Dame Angela Eagle has announced that she is examining options to strengthen the bonus restrictions. Ministers will visit sites linked to the most serious pollution incidents and seek explanations from company bosses.
Pollution remains a major concern
The joint regulators’ report recorded 2,991 pollution incidents across England and Wales in 2025, including 84 serious incidents.
A separate Environment Agency assessment covering nine major water and sewerage companies in England recorded 2,666 incidents involving sewerage and water supply assets, down from 2,801 in 2024. However, that figure remained 40% above the 2016 baseline.
The English assessment identified 74 serious incidents. Thames Water, Yorkshire Water, Southern Water and Anglian Water accounted for 61 of them. The England-only assessment and the joint England-and-Wales report cover different reporting populations and should not be conflated.
Environmental improvement targets missed
Regulators found that 142 of 2,254 planned environmental improvement actions were not delivered on time, equivalent to a completion rate of 93.7%.
Water companies have committed more than £104 billion of investment between 2025 and 2030. Regulators say this spending must result in measurable improvements for consumers and the environment.
Government promises tougher action
The Environment Secretary says ministers will demand company-specific improvements, including reductions in pollution and leakage and better customer satisfaction. The Government is also pursuing wider reforms through its proposed Water Bill.
Existing enforcement powers include fines, prosecutions and mandatory improvement measures. Additional changes to executive bonus restrictions remain proposals, with further details expected in the coming weeks.
Drinking water quality remains high
The joint report found that 99.97% of drinking water tests met required standards, while internal sewer flooding incidents have fallen by 43% in recent years. The overall picture is therefore mixed: strong drinking water quality alongside continuing environmental shortcomings.
What happens next?
Ministers are expected to set out further details of bonus restrictions and meet chief executives of underperforming firms. The question for billpayers is whether tougher oversight and substantial investment will produce cleaner waterways, more reliable services and better value for money.