Fluoride in Drinking Water
Currently, only water provided from the Elgin Area Primary
Water Supply System is fluoridated. Fluoride is not added
at the Lake Huron Primary Water Supply System. The City
of London adds fluoride to Lake Huron water as it enters their
distribution system to ensure that fluoride levels are
maintained throughout the city.
Why is fluoride added to
Fluoridation is a safe and
cost-effective way to prevent tooth decay. Depending on
the water source, some municipalities may have naturally
occurring levels of fluoride in their drinking water supply.
Others do not, so they adjust their fluoride levels to prevent
What type and quality of fluoride is
At the Elgin Area Primary
Water Supply System, hydrofluosilicic acid (HFS) is the chemical
used for fluoridation.
Any chemical used in the
operation of the drinking water system that comes into contact
with drinking water must meet applicable standards set by both
the American Water Works Association (AWWA) and the American
National Standards Institute (ANSI) safety criteria standard
NSF/60: Drinking Water Treatment Chemicals - Health Effects.
NSF is responsible for the certification of water treatment
chemicals to ensure that they do not contribute contaminants to
drinking water that could cause adverse health effects.
How much fluoride is in the drinking water?
Ontario Regulation 169/03
(Ontario Drinking Water Quality Standards) under the Safe
Drinking Water Act, 2002, establishes a maximum acceptable
concentration of 1.50 mg/L for fluoride in drinking water.
It is further recommended that where fluoride is added to
drinking water, the concentration should be adjusted to between 0.50 mg/L
- 0.80 mg/L, which is the optimum level for the control of tooth
On average, the fluoride
concentration of the treated drinking water from the Elgin Area
Primary Water Supply System is maintained at 0.65 mg/L.
Where can I find more
information on fluoride?
For more information, please
visit the websites of the following professional organizations: