The floods also caused a lift at Block 67 Marine Drive to break down due to water entering the lift shaft.
Business at a convenience store in the same block was also disrupted for a few hours.
PUB said that it takes a serious view of such incidents.
“Any damage to our water mains will incur significant amounts of water wastage, result in economic losses and cause disruption and inconvenience to the public.
“Contractors must refer to PUB’s Water Service Plan and exercise caution when carrying out construction works within close proximity to water mains. Contractors are also required to ensure all necessary safety precautions are implemented before the commencement of works.”
Under the Public Utilities Act, anyone who damages a water main or connecting pipe with a diameter of 300mm or more may be jailed for up to three years, fined up to S$200,000, or both.
Contractors who carry out works in the vicinity of water mains without an approved plan may be fined up to S$10,000.