A number of water handout points have been set up in London to provide the worst affected people with fresh water.
Orange and yellow alerts for snow and ice are still in place across Ireland until midday on Monday.
Thames Valley, Affinity Water, South East Water and Southern Water have urged customers who do have running water only to use it where essential.
"We are dealing with multiple leaks in cities, towns and villages so when we fix a pipe there are others still causing issues and water is not returning".
Farther north, Scottish Water said there was no significant impact on its customers because Scotland had not suffered the same rapid thaw.
After Storm Emma, around 12,000 homes are now without water access or are experiencing very low-pressure levels in London alone, according to data released by Thames Water.
People across Berkshire are urged to keep a close eye on how much water they use after multiple bursts and leaks led to huge pressure on supplies. This will make a real difference.
A Tweet from the water supplier said: "We're sorry to customers in Ashford Lenham who are waking up to no water this morning".
"We would also ask all our customers to check their own pipes for bursts and call a plumber if necessary". We want to thank everyone for their patience and for bearing with us while we've got everything back to normal. There has been an increase in leaks across networks as the Beast from the East and Storm Emma recede.
'This preparation helped us reduce the time customers had either no water or reduced pressure.