Water bosses have issued reassurances to customers in Preston after reports of discoloured water coming from taps.
United Utilities said they had received calls from families who were finding discoloured or brown water coming from their taps, in the PR1 and PR2 areas of the city.
A spokesman on the company’s website said: “This has happened because of a disturbance to the pipes in your area.
“Our pipes have naturally occurring sediments and minerals at the bottom which can get disturbed every now and then.
“We know it doesn’t look nice but don’t worry, it’s unlikely to be harmful and will settle down again with time.
“You can help with this by letting your cold water tap run at a slight trickle until your water runs crystal clear again.
“In the meantime we have one of our inspectors keeping an eye on this to make sure it settles back down again soon.
“We’re sorry if this has affected you getting on with your everyday jobs.”
On Wednesday, engineers repaired a technical fault after water had either stopped or was coming out slower than normal in the PR2 area.
The company said it suffered a minor technical fault in the water mains network.
A spokesman for United Utilities said that fault - that occurred at the Whitebull resevoir, near Longridge - affected fewer than 40 homes and apologised for any inconveniences the issue caused.