The fractured pipe in Bridge Street, Glasgow, created a five metre-wide hole in the middle of the road and caused flooding in the area.
Roads were closed while the incident was dealt with and traffic was still being diverted this morning.
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Residents and shopkeepers from the adjacent building were evacuated as a precaution as emergency services dealt with the incident. Residents were allowed back into their properties at around 1.30am.
Video from last night filmed by Terry Forteath
Scottish Fire and Rescue Service crews also went to the scene, along with police, Glasgow city emergency planning officers and utility companies.
A number of wards at the Victoria Infirmary were also left without water.
The supply to properties in Glasgow's southside were affected after the main burst at around 8pm last night, with loss of supply, low pressure and discoloured water.
The affected postcode areas were G4, G5, G41, G42, G43, G44 and G45 with Shawlands, Pollokshields, Mount Florida, Newlands and Battlefield among the areas experiencing problems.
Scottish Water said they received around 3000 calls reporting disruption last night.
They sent engineers to the scene in Bridge Street and said that water supplies were restored to customers at around 11pm.
In a statement on its website, the company said: "A team was sent to Bridge Street at around 8pm to assist customers, isolate the section of burst mains and re-zone the network. As a result customer supplies were restored by around 11pm.
"As well as damage to the water mains, the road at Bridge Street has been affected and repairs will be carried out as soon as possible. There has also been some localised flooding.
"Scottish Water staff have been in the area helping customers during the night and will continue to be present to provide assistance.
"We would like to take this opportunity to apologise for the inconvenience caused and thank customers for their patience and understanding."
A spokeswoman for NHS Greater Glasgow and Clyde said: "Some wards in the old hospital are without water, but bottled water is being brought in. Patient care has not been affected."
Fire service spokesman Ian Burns said: "This is an excellent example of inter-agency working to help resolve a challenging situation and restore normality as quickly as possible."