The Consumer Council for Water (CCW) rated both companies ‘poor’ for performance measures.
Meanwhile, Portsmouth Water and Bristol Water were the only companies to score ‘good’ in both metrics, retaining their position at the top of the rankings as the sector’s best performers.
This is based on the number of complaints a company received for every 10,000 households it serves.
This comes after complaints to the watchdog has seen its largest-ever annual increase following the steepest hike in charges since privatisation.
Debt-laden Thames Water is one of five firms provisionally allowed to increase customer bills even further between 2027 and 2030, alongside Severn Trent Water, Southern Water, Wessex Water and South East Water.
READ MORE: Clarkson’s Farm’s star shocks fans with real age after birthday celebrations
A prank sign at Thames Water’s HQ in Reading (Image: @Athirty4)
The CCW reported that household complaints are up 84%, the biggest year-on-year rise in the watchdog’s 20-year history, it said.
Meanwhile, complaints made by bill-payers directly to water companies have also soared, by 56% on last year.
A spokesman for Water UK, which represents firms, said: “We understand increasing bills is never welcome, but the money is needed to fund vital upgrades to secure our water supplies, support economic growth and end sewage entering our rivers and seas.
“The vast majority of these complaints – 94% – are being dealt with at the earliest possible stage without the need for further involvement from the consumer body.”
Environment Secretary Angela Eagle said: “I completely share the frustrations voiced today. For too long, people have had to put up with rising water bills and unreliable services.”
Thames Water have been contacted for a comment.
#Thames #Water #named #worst #performing #water #companies