Thousands of people were left without water on Sunday due to an issue at a Thames Water treatment works.
Thames Water apologised to residents in Godalming, Surrey, and said it was investigating.
Jeremy Hunt, the MP for the area, said a major incident had been declared. He posted on X, formerly known as Twitter, that he was very concerned and had spoken to the CEO of Thames Water.
It follows issues caused by Storm Ciaran at Shalford water treatment works, Thames Water said.
Bottled water stations have been set up at the Crown Court car park in Godalming and Artington park and ride in Guildford.
Thames Water said it was also delivering bottled water to vulnerable customers.
Thames Water engineers were on site, the water company said, and tankers were being used to pump water into its supply network.
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