The scammers have been targeting vulnerable people in Lanarkshire by going to their houses and asking to check the water pressure on their boiler.
They claim they need to do so because of a burst pipe in the area, according to Police Scotland.
In response to the scam, a Scottish Water spokesperson said: “Anyone calling from Scottish Water, either an employee or a contractor working on our behalf in your area, will always carry an photo identification (ID) card.”
"This may be either a Scottish Water ID card, or they may have an ID card for the contractor.
“They will usually drive vehicles clearly marked with our logo.
"Employees or any contractor working for us, will never ask for, nor accept, any money from you at your home."
Scottish Water also has a web page on Bogus Callers members of the public can visit.