What makes water hard?

If substantial amounts of calcium and/or magnesium, both nontoxic minerals, are present in drinking water, the water is said to be hard. Hard water does not dissolve soap readily, so making lather for washing and cleaning could be difficult with hard water. 

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1. Is there lead in my drinking water?
2. Is there a water fill station in Ponca City?
3. What makes water hard?
4. What’s my water footprint?