We add a small amount of fluoride to our drinking water.

About fluoride

Fluoride is a mineral found in all water

At proper levels, it:

  • Strengthens the tooth’s surface
  • Makes teeth more resistant to cavities
  • Helps rebuild the tooth’s surface after decay has already started
  • Reduces tooth decay by 18% to 40% in people of all ages who have frequent and consistent contact with it


Fluoridation is a process through which we:

  • Add a small amount of fluoride to our drinking water
  • Bring it to an optimal level for preventing tooth decay

Fluoridation of drinking water was named as one of the Ten Great Public Health Achievements in the United States.


Adding fluoride to drinking water:

  • Promotes public health
  • Reduces the gap in decay rates between low-income and upper-income Americans

Amount of fluoride in our water

There is less than one drop of fluoride in one million drops of water of our drinking water.

Our system is set up to prevent adding too much fluoride.

We test our water to ensure the fluoride levels are correct.

  • Every day, certified operators test water samples.
  • The samples come from locations representative of the entire drinking water system.
  • Every month, we report test results to the Minnesota Department of Health.
  • Every three months, we send duplicate samples to the Minnesota Department of Health.

See Minneapolis water quality reports 

See state and federal guidance on fluoride in drinking water

Health and safety

Extensive research over 70 years supports community fluoridation's:

  • Safety 
  • Effectiveness
  • Long-term benefits

Long-term exposure to high levels of fluoride can cause:

  • Bone weakness or fractures
  • Severe dental fluorosis — a change in the appearance of the tooth’s enamel
    • In the United States, most fluorosis is mild and appears as faint white spots on the tooth’s surface.
    • It occurs when young children get too much fluoride while their teeth are developing.
    • It cannot develop or worsen once permanent teeth break through the gums.

Read scientific reports on fluoride


Translated fluoride fact sheets

You can download fluoride fact sheets in many languages.

Contact us

Public Works Water Treatment & Distribution Services


For water emergencies


For water quality information



4300 Marshall St. NE
Fridley, MN 55421

This building is closed to the public.