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  • Hardness of Water | U. S. Geological Survey - USGS. gov
    In scientific terms, water hardness is generally the amount of dissolved calcium and magnesium in water But in layman's terms, you may notice water hardness when your hands still feel slimy after washing with soap and water, or when your drinking glasses at home become less than crystal clear Learn a lot more about water hardness on the Water Science School site
  • Do you have information about water hardness in the United States?
    See the USGS map of water hardness (as calcium carbonate) in surface water of the United States Under the Safe Drinking Water Act, primarily administered by the U S Environmental Protection Agency (EPA), your drinking water supplier is required to send you information about the quality of your drinking water every year These annual drinking water quality reports (also known as consumer
  • Water Science School | U. S. Geological Survey - USGS. gov
    Welcome to the U S Geological Survey's (USGS) Water Science School We offer information on many aspects of water, along with pictures, data, maps, and an interactive center where you can give opinions and test your water knowledge
  • The Water in You: Water and the Human Body - USGS. gov
    Water is indeed essential for all life on, in, and above the Earth This is important to you because you are made up mostly of water Find out what water does for the human body
  • Alkalinity and Water | U. S. Geological Survey - USGS. gov
    Definition of alkalinity: "The buffering capacity of a water body; a measure of the ability of the water body to neutralize acids and bases and thus maintain a fairly stable pH level"
  • Water Properties Information by Topic | U. S. Geological Survey
    Looking at water, you might think that it's the most simple thing around Pure water is practically colorless, odorless, and tasteless But it's not at all simple and plain and it is vital for all life on Earth Where there is water there is life, and where water is scarce, life has to struggle or just "throw in the towel " Continue on to learn about dozens of water properties
  • Quality of Ground Water - USGS Publications Warehouse
    Hard water can be softened at a fairly reasonable cost, but it is not always desirable to remove all the minerals that make water hard Extremely soft water is likely to corrode metals, although it is preferred for laundering, dishwashing, and bathing Ground water, especially if the water is acidic, in many places contains excessive amounts of
  • pH and Water | U. S. Geological Survey - USGS. gov
    pH is a measure of how acidic basic water is The range goes from 0 to 14, with 7 being neutral pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base The pH of water is a very important measurement concerning water quality
  • Dissolved Oxygen and Water | U. S. Geological Survey
    Dissolved oxygen (DO) is a measure of how much oxygen is dissolved in the water - the amount of oxygen available to living aquatic organisms The amount of dissolved oxygen in a stream or lake can tell us a lot about its water quality
  • Facts About Water | U. S. Geological Survey - USGS. gov
    Yes, of course the most obvious fact about water is that it is wet, at least in the liquid state But, there are many more facts about water that make it a most fascinating substance, one that all life on and in the Earth depends on





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