Hard water is created when water moves through soil and rock dissolving small amounts of naturally occurring minerals. These minerals primarily include calcium and magnesium which are nutrients frequently found in food. Hard water is not a health concern and thus water providers typically do not treat for it. Front Range communities, like Castle Rock, have Moderately Hard to Hard water.
While Castle Rock Water does not advocate using water softeners due to the amount of salt that can impact the wastewater system, hardness settings for Castle Rock are between 6.6 to 10.8 gains per gallon (GPG) or 108 to 125 parts per millions (ppm).