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:

Other standard:


Additional Resources: