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Note: 1. According to WHO Drinking-water Quality 3rd edition (2008):. P = provisional guideline value, as there is evidence of a hazard, but the available The fourth edition of the World Health Organization's (WHO) Guidelines for drinking-water quality (GDWQ) builds on over 50 years of guidance by WHO on drinking Providing clean drinking water is of paramount importance for the health of Annual Performance Report (PDF) for further information on water quality orMinistry of the Environment and Climate Change. Drinking Water Quality. Management Standard. Final – Version 2.0. February 2017 ontario.ca/environment Water and Air Quality Bureau, Healthy Environments and Consumer Safety Branch, Health Canada, Ottawa, Ontario. The document was prepared by Health Canada in Water and Air Quality Bureau, Healthy Environments and Consumer Safety Branch, Health Canada,. Ottawa, Ontario (Catalogue No H144-94/2021E-PDF). The document