Toronto's water is fluoridated, based on recommendations of the Canadian Dental Association, and supported by Toronto Public Health.

Fluoride levels vary between 0.5 and 0.6 milligrams per litre. Hydrofluorosilicic acid is the chemical used to add fluoride to the drinking water.

Visit the City of Toronto website for Commonly Asked Questions about Tap Water.

Concerns about water fluoridation
People opposed to water fluoridation have been raising concerns since the introduction of this public health intervention. However, the long term use and benefits of water fluoridation world-wide do not support these concerns.

Toronto's drinking water has been fluoridated since 1963. The Toronto Board of Health whose members are citizens, city councillors and representatives from the school boards, revisited the issue of water fluoridation on April 4, 2011. At the meeting, there was extensive discussion and a number of presentations by those in favour and those opposed to water fluoridation. Following the lengthy meeting, the Board unanimously reaffirmed its position to continue the fluoridation of Toronto's water.

The materials for that meeting can be viewed on the City of Toronto website. The Toronto Medical Officer of Health's position on water fluoridation and, the April 2011 Report on Water Fluoridation in Toronto. The 49 references from scientific articles and reports used to produce the Toronto Report on Water fluoridation are listed at the end of that report.

Subsequently, Toronto Public Health undertook an extensive review of the material submitted by those opposed to water fluoridation at the Board of Health meeting. At the end of the review, The Medical Officer of Health concluded that none of the submitted materials contain information that would warrant further investigation of the safety and effectiveness of community water fluoridation in Toronto.

Water fluoridation has proven to be the most cost-effective and equitable strategy for the prevention of dental caries. National and international scientific bodies continue to reaffirm the safety and effectiveness of water fluoridation. As per Guidelines for Canadian Drinking Water Quality: Guideline Technical Document - Fluoride, Health Canada endorses water fluoridation as a safe public health measure to prevent dental decay. Several international agencies including the World Health Organization, The Centre for Disease Control, the European Union Scientific Committee on Health and Environmental Risks, etc. endorse and promote fluoridating potable water.

Toronto Public Health continues to actively review the scientific evidence on the safety and effectiveness of water fluoridation. Based on the current evidence, Toronto Public Health will continue to recommend strategies for health improvement based on credible scientific evidence.

Related information:

    • Board of Health report on water fluoridation in Toronto
    • Toronto Medical Officer of Health position on fluoridation: report