Zinc is a bluish white metal that is found naturally in many rocks and soils. It is found primarily as sulphide ores and sometimes, to a lesser extent, carbonates. Zinc can be introduced to the water supply by natural erosion of the rocks and soil. It can only dissolve at relative low concentrations. It also can reach the water supply as a by-product from steel production plants and coal power stations, as well as the burning of waste materials. Zinc is also sometimes used in fertilizer and may leach into the ground water that way. Older galvanized pipes can also contain zinc with will dissolve over time with acidic waters.

Zinc is a necessary nutrient in the human body and encourages body growth and development, however high levels of zinc in you water can lead to stomach cramps, nausea and vomiting.