 Occasionally water supply is cut for several days, as occurred in January 2009 when the water supply from the Cutzamala system had to be reduced cutting water to 5.5 million people for three days.This incident was followed by a second supply cut in March 2009, and most recently a third cut in April 2009.This third cut was done in response to alarmingly low levels in the city's water reserves, and reparations being undertaken on the Cutzamala system.