A pipe under a main road near Accrington town centre has burst and is overflowing.
Water has been running down Burnley Road near the turn off to Pennyhouse Lane since around 7.30am this morning.
A spokeswoman for United Utilities said an engineer is dealing with the incident.
She added: "We do rely on people reporting these matters to us. It looks as though it is a burst water pipe. We are currently investigating the matter."