Water Supplies Department (HK) -ENG
Bureau of Waterworks Tokyo Metropolitan Gov-JAP
Waterworks Bureau The City of Hiroshima-JAP
Environment Protection Department -ENG
World Water Monitoring Day™ -ENG
World Health Organization –ENG


Tap Water
The water is collected from a variety of sources such as rain collected by reservoirs, mountain streams, or underground water. These natural water will be treated by the water plants through filtering, sanitation, pH adjustment to become our fresh water supply coming out from our taps at home or at work.

Distilled Water
Normally, tap water will be used for this process. The water is heated to its boiling point at 100°C , transforming it to gaseous stage (commonly known as steam). This will in turn be cooled down to become purified water. Impurities such as miscellaneous minerals, small inorganic particles in the original tap water are left behind and germs are killed during the process.

Reverse-osmosis purified water
Water is pressurized and forced through a special membrane. Particles are filtered out to achieve purification.

Purified Water
Potable water is treated through distillation and reverse-osmosis processes to achieve ultra-pure water.

Mineral water and beverage with mineral additives
These are not mineral water collected at its natural sources. They are normally tap water with measured mineral additives to a certain approved pH and mineral balance.

Natural mineral water
Only water that is directly collected and bottled at its natural sources can be called natural mineral water. Water plant will filter and remove physical impurities and unstable dissolved mineral content before bottling to attain optimum shelf life. Total Dissolved Solid (TDS) is typically above 250mg per litre.

Spring Water
Similar to natural mineral water, spring water is directly collected and bottled at its natural spring sources. Total Dissolved Solid (TDS) is typically below 250mg per litre.

Do not over-stock on fresh water

Take showers instead of baths
Re-use lightly used water, such as hand-washing, vegetables and fruit rinsing etc., for cleaning floors or watering plants.
Load up your washing machines and dish-washing machines for maximum water efficiency
Watch out for faucet dripping and fix them as soon as possible
Educate your children to conserve water. It's a scarce resource in other parts of the world.
Be sure to clean and sanitize your storage tank at least once every three months