Calgary reintroduced fluoride to its drinking water system on June 30, 2025. Shutterstock/Andrew Zarivny
The City of Calgary is reintroducing fluoride back into its drinking water, saying it helps prevent tooth decay. The city had removed the mineral from its water system in 2011.
Effective June 30, fluoride levels will be maintained at “optimal” concentrations of 0.7 milligrams per litre, according to Health Canada’s guidelines, the city says on its website, noting that the mineral is “naturally found in water, air, soil and almost all foods” in lower levels.
