The Campaign for the Renewal of Older Sewerage Systems (CROSS) has been launched by Labour MP Joan Walley in a bid to improve the sewer network.
She warned: 'The water companies estimate that 2,400 km of main sewers need urgent attention.'
The group is campaigning for a 'sewer summit' in the mould of the water summit held earlier this year.
According to CROSS, only 250 km of sewers were renovated last year.
Water industry regulator OFWAT estimates that there are 7,170 km of critical sewers.