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The Tweed Drinking Water System does not add Fluoride to the system. Fluoride is naturally occurring and quarterly sampling is conducted (over and above the regulation required every 60 months sampling). The sample results for treated water supplied to consumers has never exceeded the Maximum Acceptable Concentration (MAC) limit as stated in the Safe Drinking Water Act O.Reg 169/03 for fluoride.
Under the Safe Drinking Water Act (SDWA) O. Reg. 169/03, the MAC for fluoride is 1.5 mg/L. This is also the MAC recommended by Health Canada in the Guidelines for Canadian Drinking Water Quality: https://www.canada.ca/en/health-canada/services/publications/healthy-living/guidelines-canadian-drinking-water-quality-guideline-technical-document-fluoride.html .
The MOHLTC's Safe Drinking Water and Fluoride Monitoring Protocol, 2019 https://www.health.gov.on.ca/en/pro/programs/publichealth/oph_standards/docs/protocols_guidelines/Safe_Water_Fluoride_Protocol_2019_en.pdf outlines the MOH's role in monitoring and following up on fluoride results related to drinking water. This document recommends (for those systems that do provide fluoridation) a therapeutic range is 0.6 to 0.8 ppm (and also notes that exceedances of fluoride above the Maximum Acceptable Concentration (MAC) of 1.5 ppm (mg/L) for all municipal water systems follow the same process for any exceedance of a drinking water quality standard). For more information on this protocol and how the MOH would respond to fluoride MAC exceedances, please contact Hastings Prince Edward Public Health.