Guidelines for Canadian Drinking Water Quality: Supporting ...
The estimated daily intake of magnesium for Canadians consuming an average diet is 205 mg for children and between 200 and 300 mg for adults. Footnote 1 The intake of magnesium from drinking water varies widely, depending on the hardness of the water. Daily intake from ingesting L of water daily would range from mg (soft water, 1 mg/L magnesium) to mg (hard water, 25 mg/L magnesium).