The four elevated tanks are holding tanks located above ground at suitable elevations. They are smaller than ground level reservoirs and are located in smaller districts where there is less demand for large quantities of water or where there is a lack of space below ground. These holding tanks are made of steel and are connected to the distribution system. The third component of delivery is distribution . Distribution is the means of transporting large volumes of water from the filtration plants to pumping stations, reservoirs and tanks and to the local water distribution systems of the area municipalities.
Distribution involves the use of large pipes known as water mains for transporting water.
Works and Emergency Services' system contains 487 kilometres of water mains that are between 150 mm and 2.5 metres in diameter. Most of the pipes in the system are made of steel, lined with cement mortar and encased in concrete. The older pipes are made of cast iron pipe. The water mains are generally buried in public streets about 1.5 metres deep. These mains have valves attached to them whose purpose is to stop or divert the flow, drain water or release air from the line.