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Alternate sources of water can be used in buildings and operation-based premises when possible to substitute potable water and NEWater, which will help businesses save on water bills.
Developers can build rainwater harvesting systems to collect rainwater for non-potable use within their own premises. The construction of any rainwater harvesting system requires PUB’s approval under Section 31 of the Sewerage and Drainage Act. More information on the application process is available here.
For large rainwater harvesting systems of sizes above 350m3, Waterborne Tax (WBT) will be charged for the volume of rainwater used. The charging of WBT will be phased in over two years from 1 April 2025 and 1 April 2026.
Note: Water is charged per cubic metre (m3), which is equivalent to 1,000 litres. All figures are before GST.
The sources of greywater are water discharged from showers, bathtubs, wash basins and laundry. As this is untreated used water not in contact with toilet waste, it excludes water from urinals, toilet bowls (water closets), kitchen sinks and dishwashers.
Before greywater can be reused for non-potable purposes like toilet flushing, general washing and irrigation as well as make-up water in cooling tower, it has to go through membrane filtration for disinfection. Certain safety requirements for treated greywater must still be met.
For public health reasons, it is however prohibited to use treated greywater for high-pressure jet washing, irrigation sprinklers and general washing at markets and food establishments.
Download Guidance Notes for Treated Greywater Quality and Technical Guide for Greywater Recycling System.
Developers can build rainwater harvesting systems to collect rainwater for non-potable use within their own premises. The construction of any rainwater harvesting system requires PUB’s approval under Section 31 of the Sewerage and Drainage Act. More information on the application process is available here.
For large rainwater harvesting systems of sizes above 350m3, Waterborne Tax (WBT) will be charged for the volume of rainwater used. The charging of WBT will be phased in over two years from 1 April 2025 and 1 April 2026.
Note: Water is charged per cubic metre (m3), which is equivalent to 1,000 litres. All figures are before GST.
The sources of greywater are water discharged from showers, bathtubs, wash basins and laundry. As this is untreated used water not in contact with toilet waste, it excludes water from urinals, toilet bowls (water closets), kitchen sinks and dishwashers.
Before greywater can be reused for non-potable purposes like toilet flushing, general washing and irrigation as well as make-up water in cooling tower, it has to go through membrane filtration for disinfection. Certain safety requirements for treated greywater must still be met.
For public health reasons, it is however prohibited to use treated greywater for high-pressure jet washing, irrigation sprinklers and general washing at markets and food establishments.
Download Guidance Notes for Treated Greywater Quality and Technical Guide for Greywater Recycling System.
