Water companies have spent £5bn on pollution. Where are the results?

England’s water industry has spent £5 billion over five years trying to tackle environmental pollution. Its customers are being asked to fund another round of improvements. Yet the latest regulatory findings expose a problem that promises of investment cannot resolve on their own: serious pollution remains high, and some environmental schemes that companies were funded to deliver are still unfinished. ¹

The assessment published on 29 October leaves eight of England’s nine major water and sewerage companies rated “poor” or “requiring improvement” for their 2025 environmental performance. Severn Trent alone received the highest rating. Together, the companies collected 16 of a possible 36 stars—their lowest combined score on record. ¹

The findings accompany the first Water Industry Performance Insights joint report, bringing together the Environment Agency, Natural Resources Wales, Ofwat and the Drinking Water Inspectorate. The regulators announced it on 29 October 2026. The environmental assessment concerns 2025, not the industry’s complete performance during 2026. ^{2 11}

That distinction matters because the joint reporting brings different measures into one view, not necessarily into one reporting period. Leakage data, for example, cover April 2025 to March 2026. The publication is also separate from Ofwat’s water company performance report for 2024–25, issued in October 2025. ^{10 5}

The record-low star total is damning, but it is not a simple measurement of how much more pollution entered rivers and seas. The Environment Agency attributed the result both to “declining performance in some areas” and to tighter standards. A tougher test can lower a score even where the underlying performance has not deteriorated by the same proportion. ¹

The more direct environmental finding is troubling enough: serious pollution incidents in 2025 remained at similarly high levels to previous years and were a “major concern”, according to the agency. The ratings should not be used to manufacture a precise increase in pollution that those findings do not establish. Nor does the headline score supply a company-by-company count of serious incidents. ¹

In Wales, Dŵr Cymru Welsh Water received two out of four stars from Natural Resources Wales. It is covered by the wider joint reporting but is not part of England’s nine-company total. ¹

There were genuine strengths elsewhere. Drinking-water quality remained “among the best in the world”, companies reduced service disruptions, and regulators recognised a long-term reduction in leakage, while calling for further improvement. These results deserve to be kept distinct: poor environmental performance is not a finding that household tap water is generally unsafe, just as high-quality tap water does not excuse pollution outside the home. ¹

The sharpest criticism, however, was about delivery rather than the scoring system. Environment Agency chair Alan Lovell told BBC News he was “very angry” about pollution levels and sympathised with the public. He also identified a failure that goes beyond whether standards have become tougher. ¹

That is the distinction customers need to hold on to. Money committed is not work completed. Money spent is not, by itself, proof of an environmental improvement. Where funded schemes remain unfinished, another investment announcement cannot serve as evidence that the earlier promise was kept.

The distinction limits what the claim can explain. It does not establish how much of the serious pollution was attributable to those causes, or settle responsibility for the unfinished improvement schemes. The industry’s response and the regulators’ findings address overlapping questions, but they are not interchangeable answers.

Water UK says record investment will help secure supplies, support growth and end sewage entering rivers and seas, while warning that improvements will take time. Companies have committed further investment through 2030 to upgrade networks and sewage treatment works. That future programme is separate from the £5 billion already invested over the preceding five years to tackle environmental pollution. ¹

For households, the cost is less abstract. Bills are expected to rise by an average of 36% between 2025 and 2030 alongside the investment programme. That is the projected increase across the period, not an additional rise already imposed in full. ¹

Patience is already wearing thin. In September 2026, household complaints reaching the Consumer Council for Water were reported to have risen 84% in a year, to their highest level in 20 years. That measures complaints reaching the consumer body, not every complaint made directly to water companies. Its chief executive, Mike Keil, said many customers had noticed no improvement in service or performance despite bill rises. ¹

“People support investment and understand it takes time to bear fruit,” Keil said. But “bill payers are already questioning whether their money is being well spent”. The unfinished schemes give that concern a concrete basis beyond dissatisfaction with the size of a bill. ¹

Pollution is not the only environmental pressure. Household consumption in England and Wales averaged 137 litres per person per day in 2025, little changed from the previous year. Government advisers say demand will probably need to fall as climate change, population growth and historic underinvestment put future supplies under strain. Hosepipe bans remained across large parts of both countries following the summer drought. ¹

Demand reduction cannot credibly be presented only as a household responsibility while network losses continue. Mark Owen, head of fisheries at the Angling Trust, called for further leakage cuts: “Every litre lost has already been taken from the environment while our rivers, fish and wildlife are under immense pressure.” ¹

Environment Secretary Dame Angela Eagle says she is “demanding answers from the companies that are failing”. Legislation planned for 2027 would overhaul the industry’s structure and regulation, including combining the regulators covering England. Wales plans a new regulator alongside Natural Resources Wales. Those are prospective institutional changes, not improvements delivered in the results now being assessed. ¹

The next test is therefore more practical than another promise of record spending or a new regulatory structure. Companies need to finish the environmental work they have already been funded to deliver, bring serious pollution down and show customers what their higher payments have bought. The latest assessment makes clear why investment is needed. It does not yet show that the industry is delivering enough in return.