Metals are elements present in all waterbodies with natural concentrations corresponding to local geology. Types of metals found in waterbodies may include aluminum, arsenic, copper, manganese, mercury, nickel, selenium, and zinc.

Textbooks typically explain the metal-water reaction in simple terms: When water hits the metal, the metal releases electrons. These negatively charged particles generate heat as they leave the metal. Along the way, they also break apart the water molecules. That reaction releases atoms of hydrogen, a particularly explosive element.

5 Most Common Heavy Metals in Water The five most common metals you may find in water are cadmium, manganese, arsenic, lead, and copper. All five of these metals appear on the World Health Organization’s (WHO) list of chemicals of public health concern. General signs that there is metal in your water are discoloration, metallic or salty taste.