Overview

• Anglian Water, Northumbrian Water, South East Water, Southern Water and Wessex Water together serving about 14.7 million customers won a provisional £556m, or 21% of what they sought.
• The extra allowance translates to average bill increases of roughly 3% on top of Ofwat’s previously approved rises for 2025–30.
• Company-specific additions were set at Anglian and Northumbrian +1%, Southern +3%, South East +4% and Wessex +5%.
• The CMA said the additional revenue would support supply resilience, pollution reduction and higher financing costs.
• These redeterminations are not final, with a consultation now under way before the CMA issues its final decisions; Thames Water’s separate appeal remains paused during restructuring talks.