Residents in a Cambridge area who endured almost seven days without drinkable tap water amid contamination fears have been told it is now safe to use. Problems at the Marleigh development were first reported last Thursday, with people initially told not to use tap water. From Monday they were told not to drink it, but that it was safe for them to wash, shower and do laundry. On Tuesday, it was confirmed that there had not been any reports of anyone falling ill. Today (Wednesday), Independent Water Networks (IWN) announced that the notice is no longer necessary. A spokesperson for IWN said: “We…