Depending where you live, your wastewater services are provided by either Thames Water (whose charges we include in your bill from us) or Southern Water (who send you a separate bill).
Thames Water
For sewerage problems and questions about your bill contact the 24-hour Customer Centre on 0800 316 9800.
Southern Water
For sewerage problems and questions about your bill contact the 24-hour Customer Centre on 0330 303 0368.