Calcium is an essential body element. The EPA does not set a high limit on this in water. Calcium and magnesium together are the elements of water hardness.
Sources of impurity: A naturally occurring element in groundwater.
Additional notes from Canadian government: CANADA Calcium – is a naturally occurring element that contributes to the total hardness of water.
Maine Maximum Exposure Guideline limit:
USA Primary Drinking Water Standard limit: n/a
USA Secondary Drinking Water Standard limit: n/a
Canada Health standard limit:
Canada Aesthetic standard limit:
USA daily recommended allowance: