Manx Utilities is advising residents after receiving reports of a hoax notice.
It says a 'boil notice' has been sent to some customers via e-mail under the name of 'Isle of Man Water & Sewerage Authority' - which no longer exists.
The organisation says there's no issue with water quality and no notice has been issued.
It's added if you receive this message to disregard and delete it.
Road closures for Manx Motor Racing Club from next week
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Dinner event raises over £3,600 for brain tumour charity
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Man admits to assaulting police officer before Court
A Douglas man who assaulted a police officer after drunkenly falling and injuring himself has avoided being sent to prison.
Ramsey's Roisin in the semi-finals of BBC One show
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Help needed to care for birds at Nobles Hospital's aviary
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Nearly two tonnes of meat thrown away so far this month at meat plant
Isle of Man Meats has thrown away almost two tonnes of meat so far this month.
ITV show featuring Samantha Barks won't return for second series
A TV show featuring Samantha Barks has been cancelled after one season.
Douglas man who assaulted victim in own garden appears in Court
A neighbour dispute resulted in an assault on a man in his own garden.
