Some heavy metals including manganese and iron are often found in very high concentrations in groundwater. Other heavy metal elements that can be found in water sources include:

• Lead: from coal, gasoline, plumbing, industry and mining. Lead has an effect on the chemistry of red blood cells and delays normal mental and physical development in babies and young children.
• Mercury: This is a neurotoxin and can cause muscle weakness, lack of coordination and loss of vision. Mercury is typically introduced to the human system by ingesting fish or shellfish.
• Cadmium: this leaches into the groundwater from batteries dumped in landfills, and can cause kidney damage and may also affect bones and increase exposure to potential fractures.
• Arsenic: this is a semi-metallic element that occurs naturally in certain types of soil and rock formations. Over time, it can get into the groundwater through erosion or more directly, by run-off from industrial processes. Consumption of arsenic can lead to muscle weakness, nausea and palpitations. These effects are usually temporary, as long as the ingestion of arsenic ceases.

With the potential dangers of heavy metal pollution, it is prudent to have your water sources checked periodically.