Hard water is caused by elevated levels of calcium and magnesium that water collects as it journeys from rain to underground aquifers. Hard water is a natural result of the hydrologic cycle. Water evaporates from our oceans, transforming into clouds and then precipitating back down to earth in forms like rain and snow. Water is known as a universal solvent, and when it hits the earth as precipitation it is soft and slightly acidic. Water then percolates through the soil and rock into underground aquifers, passing through layers of limestone and gypsum. These rocks are rich in calcium and magnesium, which the water readily absorbs as it filters through them.
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