Homes across the UK are facing water supply problems – with thousands of people in Wales and south-east England urged to use as little as possible.
Water suppliers say a thaw has led to burst water mains and leaks.
About 13,000 homes are still without water in Kent and Sussex while thousands of properties in Wales and 5,000 homes in London also have no supply.
The industry regulator Ofwat has said water firms have “fallen well short”.
Suppliers across the country say teams are working to fix damaged pipes that have left customers with no supply or low pressure.
Parts of the Midlands, south-west England and Scotland are also affected.
West Midlands-based carmaker Jaguar Land Rover has agreed to stop production to preserve the water supply for homes, hospitals and schools.
Chocolate maker Cadbury has also halted production at its Bournville site after water supplier Severn Trent said supplies to the plant would be cut on Monday.
In south-east England and Birmingham, suppliers say they have been identifying vulnerable customers and providing them with bottled water.
At its peak, more than 20,000 homes in London were left without water on Sunday.
But supplier Thames Water said the number of homes affected was constantly falling, and the majority of homes should be back in supply soon.
London Mayor Sadiq Khan said it was “unacceptable” that thousands of homes in the capital still lacked supply, adding: “I have sought assurances from Thames Water that they are doing everything possible to fix the problems.”
Several schools in London and Kent were closed because they were unable to guarantee running water.
South East Water has set up a number of bottled water stations in Sussex and Kent for 13,000 affected homes.
Southern Water, which had urged customers to “only use the water you absolutely must”, said it was restoring the supply to 5,000 homes in Sittingbourne, Kent but there were 900 homes without water in Hastings.
In Wales, about 4,500 customers are without water, Welsh Water said. It added it was dealing with 200 leaks a day and the problems are “likely to continue over the next few days.”
Thousands of customers are also without water in parts of Birmingham, the West Midlands and Staffordshire.
Yorkshire Water, United Utilities, Affinity Water, Anglian Water and Bristol Water also said they were dealing with problems.
Severn Trent, which said it had seen nearly a 4,000% increase in reports of burst pipes, thanked Coventry-based carmaker Jaguar Land Rover for agreeing to stop production “to help us target our supply”.
South West Water said it has an “unprecedented number of burst water mains” and warned some customers in Devon and Cornwall that, although water can be used, there is a “noticeable taste”.
The Government’s water industry regulator Ofwat has released a statement which said “a number of water companies have fallen well short on their forward planning”.
Rachel Fletcher, chief executive of Ofwat, said customers had been left “high and dry” because of firms’ support and communication.
She said: “Water companies have been warned time and again that they need to be better at planning ahead to deal with these sorts of situations, including proactively communicating with customers when they anticipate issues.
“While the recent severe freeze and thaw have undoubtedly had an impact on pipes and infrastructure, this weather was forecast in advance.”
Parts of the UK are still recovering from the effects of Storm Emma, with more than 100 schools in Wales still shut due to snow or icy conditions.
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In Cumbria, the RAF has been called in to fly food supplies, coal, logs and electrical heating appliances to isolated communities, where many homes have been cut off from all supplies for five days.
And in Scotland, two Met Office yellow warnings for snow, rain and ice remain, with people being urged to travel with caution, while ongoing bad weather has been slowing down water repair works.
Scottish Water said: “Weather and road conditions have presented challenges in maintaining our usual response services and we apologise if you’ve experienced a delay in us getting to you.”
In London, customers said they could not register outages as the helpline was unavailable, while shops reportedly ran out of bottled water in some areas.
“We are putting as much extra water as we can into our local networks and fixing leaks and bursts as quickly as possible,” Thames Water said in a joint statement with South East Water, Southern Water and Affinity Water.
“Please do not use water for anything that isn’t essential. This will make a real difference.”
Jerry White, business manager at Thames Water, said engineers were “working extra hard” over the weekend.
He said there had been a “20% jump in the demand for water in the last five days”.
The problems came after a prolonged period of cold weather for much of the UK.
Water companies said cracks and splits had been caused by the freeze which are now being exposed as the pipes thaw.
Temperatures in most places increased over the weekend, however, two yellow warnings are still in place.
One, warning of snow and ice in Scotland, is in force all day on Monday. A second yellow warning for rain and snow in Scotland is in place for Tuesday.
Meanwhile, no more flood warnings remain in place although the Environment Agency has issued 15 less severe flood alerts.
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