Abstract
The water demand in the Saudi Arabian capital, Riyadh, is growing in according with the vast population growth. The principal source of water in Riyadh is Minjur aquifer, a sandstone aquifer more than 1200 meter below ground. It has high hardness, sulphate and salinity. There are numbers of reverse osmosis plants to supply fresh water to the city with a total capacity of about 192,000 cubic meter per day. This paper analyzes the water demand and supply in Riyadh. It also outlines the possible water resources including the processed water to satisfy the increasing rate of water consumption.