Firefighters dealt with a burst water main on Muswell Hill Road.
The water was at a depth of eight inches in places and caused the roadway and pavement to collapse.
Six basements were affected and around 10 people have been evacuated. Fire crews pumped water away from properties into storm drains and using sand bags to help prevent water from getting into some homes.
The Brigade has a range of equipment which can be used to help rescue people trapped by flood water, pump water away and protect properties. Some of the Brigade's fire rescue units are equipped with water rescue equipment such as inflatable rescue boats. The Brigade also has a number of high volume pumps stationed at strategic locations across the capital. These can be used to pump large amounts of water away from flooded areas.
The Brigade was called at 1439 and the incident was over for the Brigade at 1907. Firefighters from Hornsey, West Hampstead and Kentish Town fire stations were at the scene.