Lambton Public Health (LPH) says local residents are currently not receiving optimal amounts of fluoride through their drinking water.
The Lambton Area Water Supply System (LAWSS) is undergoing maintenance on the fluoridation system and, as a result, levels have not been optimized since January 20, 2026.
LPH is required to notify impacted residents when fluoride concentrations in their water supply fall outside the therapeutic levels (0.6–0.8 ppm) for more than 90 consecutive days.
LAWSS supplies water to customers in Sarnia, Point Edward, St. Clair Township, Lambton Shores, Plympton-Wyoming, Warwick Township, and Brooke-Alvinston.
LPH said while optimizing fluoride levels in drinking water prevents tooth decay, this temporary pause does not affect the safety of the drinking water and there are no immediate health risks to the public.
In accordance with the requirements of the Ontario Public Health Standards, the health unit reviews drinking water quality reports for all municipal drinking water supplies in which fluoride is added.
Repairs to the system are underway, and water fluoridation will resume once they are completed. The work can be done once a replacement part comes in.
We're being told to protect our dental health by brushing our teeth with fluoridated toothpaste.
LPH said those at higher risk of tooth decay or who have any concerns about the impact of reduced fluoride levels on their oral health may wish to consult a dental health professional regarding additional preventive measures.
The use of additional products containing fluoride must be recommended by a dental health professional after an assessment of individual oral health and risk for tooth decay.
Individuals from low-income households may qualify for free dental programs.
For more information about these programs, please call 519-383-8331, ext. 3531.
