The group said it will work with both Thames Water and Tideway, the firm responsible for delivering the Thames Tideway Tunnel, to focus on the effect that construction would have on customers.
A dispute resolution system will be needed throughout construction, CCWater said, to ensure that every customer will be able to “seek satisfaction if something falters”.
Ofwat said in July that customers are set to benefit from any underspend on the £4.2 billion tunnel.
The regulator wants customers to get 70 per cent of any underspend on the tunnel, with the rest going to the recently appointed infrastructure provider (IP) Bazalgette Tunnel Limited.
In the same month, CCWater called for Thames Water customers, who will be paying for the tunnel, to be given more information about the project’s effect on their bills. The group has insisted that the water company and the regulator must provide a “clear explanation” the project will have on bills.
The current average annual household bill for Thames Water customers already includes £7 for the tunnel, and this will eventually rise to a maximum £25 before inflation. This is sharply down from the original maximum estimate of £80 set four years ago.
Fresh government analysis this month confirmed that the super sewer is set to bring benefits of almost £13 billion to the environment, including preventing millions of tonnes of sewage flowing into the river and improving water quality in the city.