Thames Water has written to the industry regulator Ofwat to ask permission to charge customers an addition one-off fee of about £29 per household. The firm, which made £150m profit last year, has blamed "unquantifiable" costs.
Thames Water director Richard Aylard has told ITV News that the water regulator Ofwat didn't plan ahead for their big infrastructure projects, such as the Thames Tideway Tunnel, despite knowing the funding would be necessary.
He told ITV News Business Editor Laura Kuenssberg the company would have taken responsibility for funding the project, if they had been allowed to make an allowance for the scheme.
Britain's biggest water company appeals to the water regulator to be allowed to charge its customers an extra £29 on top of their bills.
Thames Water made profits of £150m last year, and gave shareholders £92m - so why is it wanting to charge customers an extra £30?