 The major distribution system facilities include 28 pump stations (including the high service pump stations at the three water treatment plants), 11 ground storage reservoirs, 9 elevated tanks, and 78 vault structures separate from the major facilities, in addition to over of distribution and transmission main.The distribution system is divided into 17 pressure zones to maintain adequate water pressures throughout the system.There are four major pressure zones (Central Low,
North High, East High, and South High), and five smaller secondary pressure zones (Meandering Way High, Red Bird High, Trinity Heights, Pleasant Grove, and Cedardale) which comprise most of the Dallas service area.