USGS: Science Topics: water hardness

Science Topics

Water hardness

Indicator of the concentration of alkaline salts in water, mainly calcium and magnesium, as a measure of water quality.

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Water science for schools: common water measurements [New Window]: Explanation of common water properties including temperature, pH, specific conductance, turbidity, dissolved oxygen, hardness and suspended sediment for students and general public.
Water science for schools: water properties [New Window]: Educational site for elementary school students on the properties of water with links to a true/false quiz, common water measurements, pH, and water facts.

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U.S. Department of the Interior | U.S. Geological Survey
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