About 1,200 properties have no water or low pressure in different parts of Kent due to various factors affecting the South East Water (SEW) supply.
The firm has apologised to customers in the Charing, Challock and Molash areas who have been experiencing problems since Saturday.
It said drinking water supplies to about 800 properties in the area were currently affected but it was working to restore provisions.
Elsewhere, in Benenden, Rolvenden and surrounding areas, SEW said about 400 properties had low pressure or no water following recent pipe bursts and high demand during the hot weather.
Jenny Rhodes, incident manager at South East Water, said: "We are truly sorry to all our customers across Kent who are experiencing repeated disruptions."
The supplier said customers in the Herne Bay area affected by water supply issues on Sunday had supplies restored overnight.
However, it said the area was experiencing further problems on Monday morning as the drinking water storage tank which supplies the town remained critically low.
"We are doing everything we can to try and recharge the levels in the storage tank that feeds the area to try and make sure we can restore supplies as soon as possible," it said.
Five bottled water stations are open until 22:00 BST at:
The Weald Sports Centre in Cranbrook
Sainsbury's at Altira Business Park in Herne Bay
Rhodes added: "A combination of high demand for drinking water in the hot weather, burst pipes and power issues have placed severe pressure on our storage tanks and treatment works.
"We fully acknowledge that this level of service is unacceptable, especially during hot weather."
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