Four fire engines and around 20 firefighters were called to deal with a burst water main near the junction of Clapham Road and Claylands Rd in Stockwell, SW9 yesterday evening.
At the height of the incident the roadway was flooded to a depth of about four inches after the 30 inch water main burst.
Clapham Road was closed between Oval and Stockwell tube stations and several other roads in the area were also affected, including Fentiman Road, Palfrey Place, Trigan Road, South Island Place and Handforth Road.
Crews pumped water away from one flooded basement flat but no other homes are believed to have been affected. Sandbags were used as a precaution to protect properties from the water.
Station Manager Lisa Hicks who was at the scene said: “Crews did an excellent job to prevent the flood water from entering properties. They worked really hard in the early stages of this incident to divert the water away from homes and into drains by using sandbags and booms. Thanks to their efforts the damage caused by the burst main was limited."
Water levels have now subsided but Clapham Road remains closed between Oval and Stockwell tube stations.
A Thames Water spokesman says the water is not sewage.
They say it is the result of a burst water main, which had mixed with silt and mud.
Engineers are on site working to manage the problem.
A burst water main has caused flooding in south London, closing a major road. Reports suggested sewage was pouring into people's homes as a result
Local resident, Angela Reynolds, 58, said: "The road has been made into a river. It's a bit like Somerset.The water is revolting, brown, muddy - well I hope it's mud.
The water just flooded the road in 10 minutes. It was quite incredible."
A major London road was closed by the emergency services after homes were flooded with sewage as a result of a burst main.
There were reports that residents were being evacuated from their homes on Clapham Road, Kennington in South London after being trapped by the filthy water.
A policeman at the scene told onlookers "It's sewage. It's stinky. It's gone into people's basements
A Metropolitan Police spokesman said: "There is flooding on Clapham Road between Oval and Stockwell stations, which has been caused by a suspected burst water pipe.
"We are asking people to avoid the area."
Neither the fire service or police force could confirm or deny whether it was sewage causing the problem.