Guidelines for Canadian Drinking Water Quality: Guideline Technical Document – Hardness (French, HTML)

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Publisher-reported update

2021-11-30

Although hardness may have significant aesthetic effects, a maximum acceptable level has not been established because public acceptance of hardness may vary considerably according to the local conditions. Water supplies with a hardness greater than 200 mg/L are considered poor but have been tolerated by consumers; those in excess of 500 mg/L are unacceptable for most domestic purposes.

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