Roanoke Fire-EMS personnel are testing fire hydrants throughout the city. Fire hydrant flushing is necessary to both test the function of the hydrants and to flush sediments that build up naturally over time in waterlines. The maintenance should end in July. During the flushing, many residents may experience temporary water discoloration. A fire spokesperson says this water is ordinarily safe to drink, but it’s best to flush any discolored water from pipes by turning on all cold-water faucets in your home or business at once. You should avoid turning on hot-water faucets so the discolored water is not drawn into hot water heaters. The flushing should remove discoloration in less than five minutes.