The Manx Utilities Authority has updated its advice after problems with contaminated water supplies in Douglas yesterday.
A large part of south Douglas was affected by the problem, prompting the MUA to warn people against using their supplies.
This morning, it says it's tested samples and customers can now use water after boiling it.
It's also advising people to run their cold taps in kitchens for 20 minutes to clear their plumbing.
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