The utility watchdog has ordered the company to reduce household charges by £46 million by the end of the decade, with the reduction translating to approximately £2.87 per property for the 16 million customers served by the supplier.
The figure represents less than the cost of a supermarket meal deal.
The regulatory body indicated that a series of financial penalties would be imposed across the sector for failures to achieve environmental objectives and service standards during the 2025/26 financial year.
These penalties would be channelled back to residential and commercial customers through their annual statements.
Under the provisional framework, the combined reduction in charges across the country amounts to £240 million by 2029/30, while £107 million would be credited to customers in the 2027/28 billing period.
However, these reductions are expected to be largely cancelled out for many households by separate proposals from the regulator that would permit companies to implement additional annual tariff increases totalling £3.4 billion.
This comes on top of an agreed average 36 per cent price rise across the five-year period leading to 2030.
A spokesperson for the utility stated that to ease the impact on customers, the regulator had approved a one-year deferral of certain outcome delivery incentive penalties.
The spokesperson emphasised that the penalties themselves remained unchanged and that consumers would still receive the full financial benefit, with no financial gain accruing to the company.
The deferral was intended to avoid sudden fluctuations in annual charges, which customer research had indicated households preferred to prevent.
The regulator noted that adjustments to bills would be influenced by numerous variables and would differ between suppliers and customer categories.
The final determination regarding outcome delivery incentive payments is scheduled for December 15, with the resulting changes to bills taking effect from April 1 of the following year.
The regulator establishes specific performance targets for each licensed water supplier, defining service levels that companies must aim to meet throughout the five-year period concluding in 2030.
Each performance target carries an associated financial incentive or penalty depending on whether a company exceeds or falls short of the required standards.
The Prime Minister outlined proposals late last month for legislative measures that would enable failing water companies to be taken into public ownership, promising a decade-long transformation of the British water system.
During his address to the Labour Party gathering, he indicated that the Environment Secretary would bring forward revised water legislation to Parliament.
The proposals raised the possibility of temporary public control of the heavily indebted supplier as ministers prepare to consider a £10 billion rescue package put forward by the company’s lenders for the nation’s largest water provider.
The announcement followed earlier remarks from the Prime Minister that consumers could not be treated as an inexhaustible source of funds, following the regulator’s August revelation of plans for further price increases beyond those already sanctioned.
The reference to unlimited funding concerned an approved mechanism designed to support investment in critical infrastructure.
The company was permitted to raise prices to finance investment in strategic water resource schemes, including the White Horse Reservoir development.
The company representative further commented that the funding would enable continued progress on essential water security initiatives, which would maintain supply for millions of customers across the capital and southern England.
The regulator’s acknowledgement of the pressing need for additional water sources was welcomed, and the events of the past summer had underscored the growing significance of delivering long-term water security for the country.