The Sungai Selangor Water Supply Scheme Phase 3 (SSP3) is a project initiated by the Selangor State Government in the wake of the 1998 water crisis which affected people from all walks of life in Selangor and the Federal Territory.

The SSP3 was identified as the most feasible solution to meet the ever increasing demand for water supply in Selangor and the Faderal Territory.

With increasing industrial, business and commercial activities, this region has over the years, attracted people from other states. With population growth, the demand for water has seen steep escalation. In 1990, the total water demand in Selangor and the Federal Territory was 1,600 million litres per day (MLD). In 2000, the increase was almost two fold with demand up to 3,050 MLD and the demand is expected to increase to 6,205 MLD in 2010 and t0 7,642 MLD in 2020.

Sungai Selangor is the last water resource in the state which can be feasibly developed to meet the increasing demand. Beyond this, raw water has to be imported via interstate water transfer from Pahang.