01 · The problem
What is happening
Singapore has a small land area, high population density and no natural aquifers or large rivers. Its national water agency describes supply as "four national taps": local catchment water, imported water, reclaimed water (NEWater) and desalinated water. Rainfall is abundant but storage is limited by land, so catchment, reclamation and desalination are combined with strong demand management and leak control. The approach is internationally cited, but reclamation and desalination are energy intensive.
Moderate severity. Material effects on people or ecosystems; actively managed. Severity is descriptive editorial metadata summarising documented effects. It is not a measured index or a score.
02 · Causes
Why it is happening
- 01
No natural freshwater reserves
There are no significant aquifers or large rivers within the national territory.
- 02
Limited land for catchment and storage
High population density restricts the area available for reservoirs and protected catchment.
- 03
Dense urban demand
A concentrated population and significant industrial and commercial demand require a reliable year-round supply.
03 · Impacts
Who and what it affects
- 01
Energy cost of supply
Reclaimed and desalinated water require continuous energy input, linking water security to the power system.
- 02
Exposure to prolonged dry spells
Local catchment yield falls during dry periods, increasing reliance on the other supply sources.
- 03
Land use trade-offs
Reservoirs, catchment protection and treatment plant all compete with other uses for scarce land.
04 · Solutions
Documented approaches
Water reclamation (NEWater)
High-grade reclaimed water produced from treated used water through advanced membrane treatment.
Expected effectCreates a supply source independent of rainfall.
Desalination
Seawater desalination plants adding weather-independent capacity.
Expected effectImproves drought resilience at the cost of higher energy use.
Catchment expansion and demand management
Maximising the island area used as water catchment, alongside pricing, education and leak control.
Expected effectIncreases local yield and holds down per-capita demand.
05 · Key indicators
What can be measured
- Supply sources
- Four national taps
Singapore's national water agency describes supply as local catchment, imported water, NEWater and desalinated water.
06 · Sources
Where this comes from
Links open the publishing organisation's site. Some point to the publisher's main page, where the named report or dataset can be found.