The SingSpring Desalination Plant, located at Tuas, is a 20-Year Build-Own-Operate Project, undertaken by Hyflux for the Singapore PUB, to supply drinking water to the western part of Singapore. This is Singapore’s first seawater desalination plant and was completed 3 months ahead of schedule in September 2005. It produces 30 million gallons of water (136,380 m³) each day. Worth S$200 million, it is one of the biggest in the world and meets 10 percent of the country's water needs. The plant also produces bottled water called the Desal H2O. Hyflux undertook the design, engineering, procurement and construction as well as the operation and maintenance of the plant.

At the desalination plant, sea water is forced through plastic membranes with microscopic pores to extract dissolved salts. Silt is removed by dousing the seawater with chemicals that coagulate the particles.

The SingSpring Desalination Plant also claims many distinctions:
- The largest reverse osmosis seawater desalination plant in Asia
- One of the largest single reverse osmosis trains in the world
- One of the largest in-filter dissolved air flotation and filtration in the world
- One of the most energy-efficient desalination plants in the world