By bizn_fun 
The five water companies serve more than 7 million household and business customers, and had asked for much larger increases to bills than the ones granted.
An independent group of experts appointed by the CMA said the firms had asked to increase bills to raise a total of £2.7bn in extra revenue, but it had allowed only 21% of this, equating to an additional £556m.
“We’ve found that water companies’ requests for significant bill increases, on top of those allowed by Ofwat, are largely unjustified,” said Kirstin Baker, who chaired the group of experts appointed by the CMA.
“We understand the real pressure on household budgets and have worked to keep increases to a minimum, while still ensuring there is funding to deliver essential improvements at reasonable cost.”
Water companies finance much of their investment plans with borrowed money. The CMA said part of the reason it had allowed a rise was because interest rates on those loans have risen, making it more expensive for the firms to carry out their plans.
Troubled firm Thames Water also appealed for higher price rises, but has deferred its case until late October while it tries to fix a rescue bid.
Water firms have been told by authorities to fix outdated infrastructure which has been found to be the cause of much river and water pollution. The Environment Agency said serious pollution incidents by water firms went up by around 60% in a year.