Up to 10,000 households in the town of Hexham in Northumberland are enduring a fourth day without running water as a result of the weekend storms.
The flooding is starting to recede
Two water mains supplying Hexham and surrounding areas were washed away and Northumbrian Water engineers have been working round the clock on repairs.
Meanwhile, thousands of residents evacuated from flood-stricken Carlisle, Cumbria, are unable to return home.
About 5,500 homes across the county are still without electricity.
In the Hexham area a further 4,500 households were left without electricity on Tuesday after a fault at a bulk supply point. Most had been re-connected within an hour.
BBC correspondent Robert Hall, speaking from Hexham, said replacing lost water would require more than a mile of temporary pipework.
But reservoirs were "running dangerously low", he said.
A spokeswoman for Northumbrian Water said some supplies would be restored by Wednesday and the rest by Friday.
Over the weekend, three people were killed and two went missing after torrential rain and gales swept northern England and elsewhere.
Michael Scott, 63, of Hethersgill, Cumbria, died after a barn collapsed on his caravan.
Margaret Threlkeld, 79, and Margaret Porter, 85, both of Carlisle, died after their houses flooded.
Flooding in Carlisle has left schools, roads and the police headquarters closed, and the city's court and hospital are running skeleton services.
The Met Office said gusts of up to 60mph will batter Carlisle until Wednesday.
Southern Scotland, which has also been badly affected by floods, can expect gusts of up to 90mph before the end of the week.
By 2230 GMT on Monday, seven flood warnings were in place in England and Wales, together with an additional 30 flood watches.
The Scottish Environment Protection Agency has issued three severe flood warnings, 15 flood warnings and a further 19 flood watches.
In other affected areas:
- Bad weather has prevented West Yorkshire Police resuming their search for a missing man in the River Aire near Bradford.
- Police in Scotland are still searching for Andrew MacDonald, 42, of Forres, who may have been swept away in the River Findhorn on Saturday morning.
- In Wales, about 50 properties in the Conwy Valley, Llanrwst and Trefriw areas have been flooded.
Ring Floodline on 0845 988 1188 for up-to-date flooding information.
MAJOR ROADS CLOSED
Willowholme industrial estate in Carlisle closed off
A69 closed at Warwick Bridge, east of Carlisle
A684 North Yorkshire closed both ways between Northallerton and Wensley
A8 Renfrewshire closed both ways between Renfrew and Inchinnan
A752 North Lanarkshire closed both ways between Townhead Road and Bargeddie Village
A84 Stirlingshire closed both ways between Doune and Callander