Health Canada Publishes Final Document on Drinking Water Guidelines: Operational Parameters

An update on all relevant information for the seven parameters: calcium, magnesium, hardness, chloride, sulphate, total dissolved solids (TDS) and hydrogen sulphide.

The guideline technical document for Canadian Drinking Water Quality: Operational Parameters has been finalized and published. This document consolidates and updates all relevant information for the following seven parameters:

• Calcium
• Magnesium
• Hardness
• Chloride
• Sulphate
• Total dissolved solids (TDS)
• Hydrogen Sulphide

Calcium, magnesium, hardness, chloride, TDS and hydrogen sulphide occur naturally and are found in most Canadian waters, with the highest prevalence in groundwater aquifers.

The document introduces refinements and clarifications to better support water system operators and regulators across Canada. The following key changes were finalized:

• Calcium, magnesium and hardness: expanded discussion on their beneficial effects and potential adverse impacts
• Chloride and sulphate: updated health and aesthetic considerations, including treatment options
• TDS: new insights into its role in taste and potential interference with treatment processes
• Hydrogen Sulphide: enhanced guidance on detection, health effects and removal technologies

This guideline document now includes a section comparing Canadian standards with those of other countries and has a stronger emphasis on taste, odour and appearance to ensure water is not only safe but also palatable.

Thank you to the Drinking Water Committee and Community of Practice for providing this notice regarding this recent update. If interested in sharing your own knowledge and experience regarding drinking water work, contact Katie Patrao at kpatrao@bcwwa.org, to learn about the Drinking Water Community of Practice.

View the guideline technical document at Guidelines for Canadian Drinking Water Quality: Operational Parameters – Canada.ca