In Florida water supplies can come from ground water near many different kinds of mineral deposits such as sulfur, manganese, or iron. Of course municipal water supplies remove these, but many well-water supplies do not, especially on rural residences. Sulfur water, found usually in areas in Florida in which there are hot springs, oil, and natural gas deposits, tend to smell like rotten eggs. Water that is found near the oceans has a high percentage of sodium chloride in it from the nearby sea, and makes the water taste bland or milky. Manganese in the water turns clothing and all kinds of plumbing fixtures black. Iron of course turns it rusty. Iron bacteria grow on the inside walls of toilet tanks, and water heaters and leaves the tank walls pure black.