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11 October 2012, 10:11 | Updated: 11 October 2012, 10:18
Thames Water bills could rise by as much as eighty pounds a year to help pay for a new super sewer.
The Thames Tideway Tunnel is being built to stop increasing amounts of sewage being discharged into the Thames.
The company has told us it will scrutinise the building costs to ensure they are kept as low as possible.
A Thames Water statement says: "We previously made it clear that bills need to rise to pay for the cost of the Thames Tideway Tunnel and are now able to give our customers advance warning of the likely increase and the timing. Ofwat sets limits on water bills in line with the work that water companies need to do, and will scrutinise the Thames Tideway Tunnel costs to ensure they are kept as low as possible."