A 3ft-wide water pipe burst in Herne Hill at the junction of Half Moon Lane at around 5am today.
This has caused substantial flooding to the road and 36 properties in the area. We're really sorry to affected customers and we are working hard to put things right as quickly as possible.
Our main priority is to get people's lives and businesses back to normal.
Our loss adjusters are en route and will soon be talking to people to get the insurance process under way.
Customers should all still have water running through their taps as we have managed to re-route our network.
More top news
Londoners who have received new electronic gadgets for Christmas are being advised to take simple steps to protect them from thieves.
The Boxing Day sales got off to a flying start with shops reporting a surge in business during the first hour of trading.
Bus strikes are planned for Monday 29 December and Monday 5 January.