Police have issued a warning to homeowners about bogus callers claiming to be from NI Water.
The callers may claim they are there to reconnect people, but the PSNI warn that may be an excuse to gain access to properties in order to commit crimes.
A police spokesperson has asked members of the public to be vigilant.
Bogus callers either distract their victim so an accomplice can enter the house or use the opportunity to scout out the property as a potential target.
Community Safety Inspector David Connery said people should be aware of the danger of bogus callers who might try to exploit the current crisis for their own purposes.
"Bogus callers often target older and more vulnerable people, especially as they know how anxious people are to get their water supplies back. They are well prepared and practised in deception," he said.
Inspector Connery said the police needed the community's help and co-operation to deal with bogus callers.
"While we understand that many people are going through a very difficult situation at the moment and are desperate to accommodate anybody who claims they can help restore their water, it is still essential to exercise common sense and check that the person is genuine," he said.
"If you witness any suspicious activity, note down any important details such as a description or car registration and contact police immediately. This information could be key in preventing or solving a crime.
"Local police can be contacted on 0845 600 8000. In an emergency, please dial 999 and ask for police. Alternatively, any information can be reported anonymously to the Crimestopper charity on 0800 555111."
More information about water shortages is available from the NI Water website, or telephone hotline on 08457 440088, on Ceefax page 169 and BBC News Online.