Open the Excel file and note the three tabs at the bottom.

1. Fluoridating Systems (green list): The systems on this list artificially adjust fluoride in water for dental benefits. The fluoride concentration is between 0.8 mg/L and 1.3 mg/L.
2. Intertied Systems (blue list): The systems on this list are connected to the Fluoridating Systems and have no other sources that would dilute the concentration of fluoride. The water system doesn't fluoridate but consumers still receive water with fluoride levels between 0.8 mg/L and 1.3 mg/L.
3. Natural: The test results of these systems show natural fluoride levels at or above 0.6 mg/L. Systems that have optimal natural fluoride levels between 0.8 and 1.3 mg/L have a grey background.

 Dentists use fluoride levels to determine patient treatment.

If you have questions on Fluoride in drinking water email Richard Pedlar or call him at 360-236-3115.