If your water quality is substandard it is due to the poor maintenance of your building supply. My own development (Park Island) has won awards for its significantly high standard of on-site water quality and supply maintenance. Direct from the scientific and systematic testing of the government (Water Authority Homepage
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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, pumping stations receiving Guangdong water, 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 meets international standards…
…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…