"Tens of thousands" of customers have been affected, said the firm, with the majority in north and west London.
London Fire Brigade attended the incident at 7.30am on 31 March. The flood was caused by an electric fault.
The fault also caused a fire.
The BBC was alerted to the fault by IT consultant Jerry Sanders, who said customers as far afield as Potters Bar, Hertfordshire and Nottingham were reporting problems with Pipex UK broadband coverage.
Pipex UK's parent company TalkTalk said that its service had been affected by the incident.
Some mobile phone services may also be affected, a BT spokesperson said.
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