Dozens of Accrington homes were left without water after two mains pipes burst on successive days.
A United Utilities water tanker was in Bamford Crescent on Friday following a burst water main at 10pm the previous day.
Bottles of drinking water were handed to houses in the street without supplies.
The 12-inch water main on Broad Oak Lane burst on Thursday evening, causing 20 customers to ring and report no water.
The problem was fixed by 8am on Friday but when the pressure was increased there was a second burst in Bamford Crescent. Water company chiefs said this leak was resolved by mid-afternoon, although some customers reported cloudy water well into Friday evening.
A United Utilities spokesman explained: "We were able to keep local customers on supply much of the night, but had to shut the main off at 3am Friday to make final repairs. Normal service was resumed by around 8am.
"Unfortunately, there was also a 'knock-on' burst on a water pipe at nearby Bamford Crescent, on Friday morning, which affected around 30 homes in the area. This occurred when we re-routed supplies, in response to the problems at Broad Oak Lane. The increase in pressure exposed a 'weak point' on the Bamford Crescent pipe, causing it to burst. This was an unusual thing to happen."
He added: "We supplied residents on Bamford Crescent with bottled water, and a water bowser, until the burst was fixed. We apologise to both sets of customers for the inconvenience."