Starting late 2017, the Water Supplies Department (WSD) implements an Enhanced Water Quality Monitoring Programme, which collects random water samples from consumers' taps for testing six metals, namely, antimony, cadmium, chromium, copper, lead and nickel. These metals could be present in internal plumbing systems, but their levels in drinking water and the corresponding health risks are usually very low if the internal plumbing systems are properly installed and maintained.
Further information about the aforesaid six metals in drinking water, their key health effects and health advice are given below.