The Prime Minister confirmed on 29 September that a strengthened Water Bill will remove the long-standing legal limit on how much of a water or sewerage company the government can own. The restriction, set out in the Water Act 1989, currently caps state shareholding at a level that varies by company but sits below three per cent in every case. Ministers say the change is designed to give government greater flexibility to intervene when water companies fail customers or the environment.
A legal relic from privatisation
The 1989 cap has no equivalent in other privatised utility sectors, which makes it something of an anomaly rather than a deliberate policy choice retained over decades. Its removal does not itself transfer ownership or inject new public money into the sector. Instead, it clears away a statutory obstacle that would otherwise prevent government from holding a larger stake, should ministers choose to act in a specific case. The distinction matters: this is a change to what is legally possible, not an announcement of nationalisation or a takeover of any named company.
Why ownership limits matter for public trust
Water is unlike most consumer markets. Customers cannot switch supplier, companies operate as regional monopolies, and the sector's performance on leakage, sewage discharges and pricing has drawn sustained public and political criticism in recent years. Against that backdrop, the government argues that public interest should sit at the centre of how such a critical service is run, and that removing artificial ownership ceilings strengthens its hand in holding underperforming companies accountable. The announcement also signals that ministers want optionality on future ownership models, without committing now to any particular structure.
Private investment remains the stated foundation
Despite the change, the government has been explicit that it still regards private capital as essential to funding the infrastructure upgrades the sector needs. Removing the cap, officials say, does not alter that reliance, and the Treasury has framed the reform as compatible with existing fiscal rules, which the Chancellor and Prime Minister have committed to meeting at the Budget with a margin for uncertainty. Continued engagement with investors and regulators, including Ofwat, is presented as the mechanism through which outcomes for consumers and the environment will actually improve, rather than the ownership rule change alone.
Local accountability and what comes next
The Prime Minister also acknowledged that mayors and strategic authorities currently have limited influence over water companies' priorities and few tools to hold them to account locally. New powers for regional leaders are expected to form part of the wider reform package. Further detail will appear in a 10-year plan for Britain due later this year, which is intended to set out the broader approach to public control over essential services and to underpin the legislative changes carried in the strengthened Water Bill. Until that plan and the Bill itself are published, the practical scope of government intervention, and which companies if any might see direct state involvement, remains undefined.