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Desalinated Water

The 4th National Tap

In September 2005, Singapore turned on its fourth National Tap, desalinated water, with the opening of the SingSpring Desalination Plant in Tuas. The SingSpring desalination plant was PUB’s first public-private partnership (PPP) project, where SingSpring Pte Ltd was appointed to design, build, own and operate the plant and supply water to PUB. This plant can produce 30 million gallons of water a day (136, 000 cubic meters) and is one of the region’s largest seawater reverse-osmosis plants.

At the SingSpring desalination plant, sea water goes through a pre-treatment process where suspended particles are removed. In the second stage, the water undergoes reverse osmosis (RO). This is the same technology used in the production of NEWater. The water produced is very pure and is remineralised in the third stage. After treatment, desalinated water is blended with treated water before it is supplied to homes and industries in the western part of Singapore.

A second and larger desalination plant with a capacity of 70 million gallons or 318,500 cubic metres of desalinated water per day, the Tuaspring Desalination Plant marks another major step in Singapore’s journey towards water sustainability. Today, desalinated water can meet up to 25% of Singapore’s current water demand.

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The plan is to grow Singapore’s desalination capacity, so that the Fourth National Tap will be able to meet up to 25% of our future water demand by 2060.


Prime Minister Lee Hsien Loong officially opens Tuaspring Desalination Plant, Singapore's second and largest desalination plant From left: Permanent Secretary (MEWR) Choi Shing Kwok, PUB Chairman Tan Gee Paw, Minister for the Environment and Water Resources Vivian Balakrishnan, Prime Minister Lee Hsien Loong, 2nd Minister for the Environment and Water Resources Grace Fu, PUB Chief Executive Chew Men Leong, and Hyflux Executive Chairman and Group CEO Olivia Lum
Last updated on 15 Sep 2015