These are the 4 national taps that have helped Singapore to have a sustainable water source:
LOCAL CATCHMENT WATER: Singapore collects rainwater through and extensive network of drains, canals, rivers and reservoirs before it is sent for treatment in water treatment plants. This makes Singapore one of the few countries which collects storm-water in a large scale for a supply.
IMPORTED WATER: Singapore has been importing water from Malaysia, Johor. The first water agreement has expired in August 2011, and the next will expire in 2061.
NEWATER: Singapore’s success story and pillar of water sustainability, is a high-grade reclaimed water produced from treated used water that is further purified using advanced membrane technologies and ultra-violet disinfection.
DESALINATED WATER: Singapore has two desalination plants and a third to be completed in 2017. The first plant opened in 2005, and produced 30million gallons of water (318500m3) a day. Currently desalinated water meets 25% of current water demand and is expected to continue to meet the 25% demand until 2060.