Created by voters in 1959, WRD is a regional groundwater management agency that protects and preserves the quantity and quality of groundwater supplies for nearly four million residents in southern Los Angeles County or 10% of the State’s population. The Water Replenishment District manages groundwater for nearly four million residents in 43 cities of Southern Los Angeles County. The 420 square mile service area uses about 250,000 acre-feet of groundwater per year taken from the aquifers of the Central Coast and West Coast Basins. This equates to nearly 40% of the total demand for water. WRD is involved in groundwater monitoring, safe drinking water programs, combating seawater intrusion and groundwater replenishment operations throughout Southern Los Angeles County.