Hong Kong enjoys one of the safest water supplies in the world. The quality of the water conforms both chemically and bacteriologically to the Guidelines for Drinking-water Quality recommended by the World Health Organization. Water Supplies Department is committed to supply the public with water that is clear, odourless, wholesome and free from pathogenic bacteria.

Water quality throughout the entire treatment, supply and distribution system is systematically monitored by means of chemical, bacteriological and biological examinations of water samples taken at catchment, intakes, Muk Wu pumping stations receiving Dongjiang, storage reservoirs, treatment works, service reservoirs, distribution systems and consumers' taps.

With proper treatment and stringent quality monitoring and control, Hong Kong is assured of a safe and wholesome water supply which complies with the World Health Organization Guidelines for Drinking-water Quality.

Although the quality of water supplied to the consumers is strictly controlled and monitored, the quality of water drawn from consumers' taps may sometimes be affected by the condition of the inside plumbing, such as the phenomenon of discoloured water due to the presence of iron from rusty pipes. It should be noted that according to the Waterworks Regulations, the consumer is responsible for the proper maintenance of the inside plumbing. If the water quality is found to be affected due to defects in the inside plumbing, the consumer is required to engage a licensed plumber to examine the inside plumbing and carry out remedial work accordingly.