Question to the Department for Environment, Food and Rural Affairs:

To ask His Majesty's Government, following the announcement by Ofwat that water bills will increase over the next five years, what proportion of storm overflows resulting in harmful nutrients entering rivers they expect to be reduced over this period; and what financial consequences will be applied to water companies who do not meet overflow targets.

For Price Review 24, which runs from 2025 – 2030, water companies are investing almost £12 billion to improve 2,800 storm overflows. This expenditure has a price control deliverable (PCD), which sets out Ofwat’s expectations for delivery.

Ofwat also sets specific performance targets for water companies. Ofwat is expanding these performance commitments for Price Review 24 to include an ambitious storm spill reduction target. If achieved, this would see average spills per storm overflow reducing by 45% by 2029 compared to 2021 levels across the industry.

Where required outcomes are not met, companies must reimburse customers, thereby holding water companies to account to deliver the investment.

Beyond storm overflows, £6 billion will be invested to reduce harmful nutrients, including phosphorous, by 28% over 2025-30, through upgrading treatment works and promoting sustainable farming.