"We would like to apologise to our customers in the Machynlleth area, Powys, who may have experienced problems with their water supply, or lower pressure, this morning, " said a spokeswoman.

BBC: Machynlleth water supply cut forces school to close

The population is growing rapidly, putting more pressure on water supply because demand is increasing but supply is not.

FORBES: Is Water A Better Investment Than Oil?

The company said some residents in and around Liverpool city could notice temporary low water pressure or a loss of supply as engineers re-route water supplies to all customers.

BBC: People evacuated after pipe bursts in Huyton

However, there were still isolated points of low pressure, and crews were testing the city's water supply.

CNN: Ike damage prompts weeklong curfew in Houston