When a crew arrives on site, they will evaluate the severity of the leak and determine if immediate repairs are needed. They will also determine if it is necessary to shut down the water main. In many cases, the main break itself may interrupt water service or reduce water pressure for customers. The District will inform affected residents as soon as possible of any disruption of water service. Yet when there are unsafe conditions or property damage, an emergency shutdown may be necessary, giving crew members little opportunity to provide advance notice. Sometimes the presence of a crew in the area and low or fluctuating water pressure are the only initial notice that can be provided. Main breaks that leave customers without water service are given the highest priority. When a break is identified, the water is turned off in the immediate area and repairs begin. The interruption of water to customers is a decision that the District takes very seriously.