People in Penwortham were left without water on Wednesday morning.
United Utilities said a leak on Margaret Road had been spotted and reported to them at about 8.30am, and was affecting customers in the PR1 poscode area.
A message on the company’s website said: “Our inspector has been to have a look and found this to be the cause for some of you having no water or just a trickle.
“A team of engineers has been requested to attend and should be on site as soon as possible.
“We’re sorry for the trouble this may be causing you and we will get your taps flowing normally again as quickly as we can.”