The recent string of hot and dry weather has Rockland County residents being asked to conserve water. Though they have not yet declared a draught emergency, United Water, which supplies 90 percent of the customers in Rockland County, has asked customers to voluntarily cut down on their water use. Rockland County Executive Scott Vanderhoef, however, says there is a crisis when it comes to the water supply. He says United Water has been pumping every drop it has during the high demand in this hot weather, with little extra capacity to spare. Water officials say and additional 3 million gallons per day of capacity has been added in the last few years. But Vanderhoef insists that will be outstripped as Rockland County's population expands.