Water Wholesale Charges Set to Rise Again in April
Wholesale water costs will increase by an average of 9% on 1 April 2026. These charges account for the largest share of a commercial water bill, covering essential services such as water sourcing, treatment, distribution, and wastewater management.
Water companies review and update wholesale charges annually, with new rates taking effect each April. Alongside rising non-commodity energy costs, this year’s increase adds further non-discretionary cost pressure for the new financial year.
Why are wholesale water costs rising?
Water contracts operate on a ‘wholesale+’ pricing structure. Wholesale charges are set by the regional water wholesaler and passed directly to consumers, regardless of the retail contract. These costs are regulated, unavoidable, and form the bulk of the price, independent of retailer agreements.
Retailers control only the ‘plus’ element of the price, covering their margin and services such as billing, customer support, and meter reading. While these services add value, the underlying wholesale cost remains fixed and beyond the retailer’s control.
This shift marks the second consecutive year of above-inflation increases following Ofwat’s 2024 Price Review (PR24). This regulatory determination governs the 2025-2030 period, signalling that high-percentage annual increases have become a structural reality for the remainder of the decade.
While the national average is 9%, the impact is non-uniform. Regional variations are dictated by the specific infrastructure requirements and capital expenditure programs of individual wholesalers. In other words, some areas and tariffs are more impacted than others.
How much will wholesale water costs rise by?
The table below highlights typical percentage increases for small to medium-sized users. It reflects average charges across water, wastewater, and, where relevant, banded surface water drainage, offering a snapshot of the increases split by water wholesaler.
Please note that for high-volume industrial users or multi-site organisations, the fiscal impact is contingent upon site-specific variables including your location, usage and meter size. These portfolios require bespoke sensitivity analysis.
How can Big Energy Group help?
In a rising cost environment, the primary lever for cost suppression is consumption optimisation. To mitigate the impact of increasing water wholesale charges, we recommend a three-pillar response:
Step one: Control usage to reduce the impact of rising wholesale prices. Review all sites, identify inefficiencies, and address leaks. Installing Automatic Meter Readers (AMRs) provides accurate, real-time consumption data for better benchmarking.
Step two: A thorough audit of historical bills, tariffs, and network infrastructure can uncover overpayments and cost-saving opportunities, securing ongoing efficiency improvements. Last year, one in three water bills we examined contained inaccuracies, meaning you could have been overpaying for years.
Step three: While wholesale costs are unavoidable, the retail element remains negotiable. Big Energy Group can conduct a market-wide tender at contract renewal to ensure the right balance of cost, service, and value-added benefits as part of your broader water management strategy.
Final Thoughts
The PR24 cycle is bringing sustained increases in wholesale prices, making proactive cost management more important than ever. Our award-winning experts can help with a tailored sensitivity analysis, detailed financial projections, or procuring a more competitive contract. Book a no-obligation consultation here.
About Big Energy Group
Big Energy Group is a privately held, British-owned energy brokerage with an established track record of helping clients successfully navigate the energy market. The company has offices in Harrogate and the Tees Valley and serves more than 500 businesses across the UK. For more information, please visit bigenergygroup.co.uk.
