Ofwat‘s water scarcity pricing proposals have moved from consultation to concrete regulatory change, landing at precisely the moment English and Welsh households are absorbing some of the steepest bill increases in the sector’s history.
The regulator has confirmed it will amend its Wholesale Charging Rules to clarify that long-run costs include water scarcity. The immediate change applies to business customers, but a separate statutory consultation on promoting water efficiency in wholesale charges remains open until 1 October 2025, signalling that Ofwat intends to push the principle further.
The concept being reached for, however imprecisely, is surge pricing: charge more when supply is under stress, and consumption will fall. The logic is borrowed from ride-hailing apps. Whether it translates to a public utility supplying something people cannot live without is a different question entirely.
Ofwat Water Scarcity Pricing Lands on Already-Stretched Household Budgets
The context makes the proposals considerably harder to sell. Reuters reports that Ofwat provisionally approved up to £3.4 billion of additional infrastructure and environmental spending for five water companies. Southern Water faces the largest individual bill increases under that package: £43 per household for 2027-28 and a further £37 for 2029-30.
Zoom out further and the numbers become genuinely difficult to absorb. Under the Competition and Markets Authority’s final decision on disputed price controls, the GOV.UK page sets out that Southern Water’s average bill is expected to reach £620 by the end of the decade, some 48% higher than 2024-25 bills. South East Water’s average bill is expected to reach £274, an 18% rise on the same baseline.
Those figures cover the end-of-decade trajectory. The current reality is already sharp. Water UK’s annual average bill data shows Southern Water’s bill rose from £478 to £703 in 2025-26, a £224 or 47% increase in a single year. Thames Water’s bill rose from £488 to £639, a £151 increase. Anglian Water’s rose from £527 to £626, up £99.
For context: Ofwat’s own 2024 price review set bills across England and Wales to rise by an average of £31 per year between 2025 and 2030. The regulator described that as £8 lower per year than what companies had proposed. The distance between the regulator’s framing and Water UK’s reported actuals is something customers will notice even if the industry would rather they did not.
Trials Already Running, Though the Details Matter
South West Water, which supplies roughly 1.8 million customers across Cornwall and Devon, has been running a rising block tariff trial with around 500 household customers, where lower consumption is rewarded with a lower unit rate. The company says 90% of participants would see lower bills on its assessments.
The Consumer Council for Water (CCW) sets out one trial structure in which the first 30,000 litres per year are supplied free, with the next 215,000 litres charged at £1.51 per 1,000 litres. That block structure is designed to reduce bills for lighter users while pricing heavier consumption at a higher rate.
South West Water has also launched a Seasonal tariff, confirmed by Ofwat’s charging trials page and the company’s own newsroom, which charges a lower rate between October and March and a higher rate during peak summer months. Anglian Water, serving 7 million customers in the UK’s driest region, is running a similar summer-winter split.
Andy White of the CCW said any new approach ‘must be fair and protect customers who are already struggling with rising water costs,’ adding that none of the schemes currently being trialled are designed to generate additional revenue for companies, with many structured so that most customers pay less overall. White also called for companies to share smart meter data so customers can see precisely where their usage sits.
My read is that the trials, taken on their own terms, are defensible. A block tariff that gives the lightest users the cheapest rate is more progressive than a flat volumetric charge. The problem is the backdrop: you cannot credibly present scarcity pricing as a consumer benefit when bills at Southern Water have risen 47% in a single year and are on course to reach £620 by 2030. The framing will not survive contact with a household already rationing the dishwasher.
The October 2025 consultation deadline is the next decision point. If Ofwat extends scarcity pricing beyond business customers without binding protections for low-income households, the political backlash will make Andy Burnham’s ‘blank cheque’ remarks look mild.
