Heavy metals such as lead, mercury, cadmium and arsenic have been known to be found in water from natural sources, industrial pollution and aging water infrastructure. Exposure to heavy metals can cause serious health consequences, including damage to the nervous system, kidneys, liver and other vital organs. Children and infants are particularly vulnerable to the effects of heavy metal exposure, which can cause developmental delays and other long term health problems. In some cases, heavy metal contaminations can cause acute poisoning and, in some situations, death. Therefore, it is important to test the water supply for heavy metals and take appropriate measure to remove them if detected. This may include the use of a filtration system that is designed to specifically remove heavy metals, or replacing aging pipes and infrastructure in order to reduce the risk of contamination.