With water consumption in Taipei County and Taoyuan on the increase, but the capacity of the Shihmen Reservoir dwindling, although the Feitsui Reservoir belongs to Taipei City, from the first day it began to fill with water it also began to supply drinking water to over a million people in the Chungho, Yungho and Sanchung areas of Taipei County.
當台北縣與桃園用水日增，石門水庫的蓄水功能又日衰，屬於台北市的翡翠水庫一蓄水，供水範圍就包括了台北縣中、永和、新店與三重一百多萬人的飲水。