Among them are iron, manganese, hydrogen sulfide and acidity. Iron Iron in water is a common problem. Since iron makes up five percent of the earth's crust, water absorbs it as it passes through the ground and into underground aquifiers, wells and surface waters. Unfortunately, iron creates some annoying problems. Iron is generally found in well water, although city water users are not immune from the problems associated with it.
Stains also appear on bathtubs, sinks and faucets.
Even small amounts of iron can cause problems. Iron in concentrations as low as .3 parts per million can cause staining. Iron can also clog pipes and damage the internal parts of water-using appliances. The elemental form of iron is found in the ground. Ferrous iron is in a dissolved state within a water supply and will not cause any discoloration, although a distinct metallic taste will be present.