Fluoride
St. Lucie West Utilities
Fluoride occurs naturally in surface and groundwater and is also added to drinking water by many water systems. Read More.
Fluoride has been promoted as a chemical that reduces dental cavities. Yet it is now well-established that fluoride primarily exerts its protective effects through topical mechanisms, such as sodium fluoride in toothpaste and mouthwash. In contrast, long-term ingestion of fluoride in water increases dental fluorosis, which includes mottling, pitting and weakening of the teeth. EPA's maximum legal limit is set at 4 parts per million (ppm) to prevent skeletal fluorosis, a condition where bones become brittle and more susceptible to fractures, although these effects may occur at lower doses.
Even fluoride levels of 0.7 ppm, the amount of fluoride in drinking water recommended by the U.S. Public Health Service, can result in too much fluoride for bottle-fed babies. EWG recommends that caregivers mix baby formula with fluoride-free water. The National Toxicology Program is investigating the potential for low doses of fluoride to alter thyroid function and childhood brain development.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 0.789 ppm | 55 | 54 | ND - 0.909 ppm |
2015 | 0.874 ppm | 51 | 51 | 0.690 ppm - 1.43 ppm |
2016 | 0.791 ppm | 44 | 43 | ND - 0.962 ppm |
2017 | 0.833 ppm | 20 | 20 | 0.583 ppm - 0.926 ppm |
2018 | 0.788 ppm | 48 | 48 | 0.200 ppm - 1.01 ppm |
2019 | 0.705 ppm | 3 | 3 | 0.699 ppm - 0.708 ppm |
ppm = parts per million
State and national drinking water standards and health guidelines
EPA Maximum Contaminant
Level (MCL) 4 ppm
ppm = parts per million
All test results
Date | Result |
---|---|
2014-01-07 | 0.845 ppm |
2014-01-07 | 0.778 ppm |
2014-01-07 | 0.785 ppm |
2014-01-07 | 0.809 ppm |
2014-01-07 | 0.794 ppm |
2014-03-05 | 0.851 ppm |
2014-03-05 | 0.831 ppm |
2014-03-05 | 0.897 ppm |
2014-03-05 | 0.845 ppm |
2014-03-05 | 0.842 ppm |
2014-04-03 | 0.744 ppm |
2014-04-03 | 0.753 ppm |
2014-04-03 | 0.767 ppm |
2014-04-03 | 0.762 ppm |
2014-04-03 | 0.751 ppm |
2014-04-09 | 0.711 ppm |
2014-05-08 | 0.853 ppm |
2014-05-08 | 0.862 ppm |
2014-05-08 | 0.797 ppm |
2014-05-08 | 0.820 ppm |
2014-05-08 | 0.757 ppm |
2014-06-05 | 0.836 ppm |
2014-06-05 | 0.822 ppm |
2014-06-05 | 0.816 ppm |
2014-06-05 | 0.816 ppm |
2014-06-05 | 0.828 ppm |
2014-07-09 | 0.891 ppm |
2014-07-09 | 0.909 ppm |
2014-07-09 | 0.801 ppm |
2014-07-09 | 0.806 ppm |
2014-07-09 | 0.830 ppm |
2014-08-07 | 0.727 ppm |
2014-08-07 | 0.747 ppm |
2014-08-07 | 0.747 ppm |
2014-08-07 | ND |
2014-09-03 | 0.777 ppm |
2014-09-03 | 0.820 ppm |
2014-09-03 | 0.815 ppm |
2014-09-03 | 0.794 ppm |
2014-09-03 | 0.797 ppm |
2014-10-09 | 0.783 ppm |
2014-10-09 | 0.778 ppm |
2014-10-09 | 0.770 ppm |
2014-10-09 | 0.819 ppm |
2014-10-09 | 0.769 ppm |
2014-11-06 | 0.759 ppm |
2014-11-06 | 0.787 ppm |
2014-11-06 | 0.804 ppm |
2014-11-06 | 0.813 ppm |
2014-11-06 | 0.815 ppm |
2014-12-04 | 0.813 ppm |
2014-12-04 | 0.823 ppm |
2014-12-04 | 0.830 ppm |
2014-12-04 | 0.827 ppm |
2014-12-04 | 0.780 ppm |
2015-01-07 | 0.873 ppm |
2015-01-07 | 0.753 ppm |
2015-01-07 | 0.875 ppm |
2015-01-07 | 0.873 ppm |
2015-01-07 | 0.858 ppm |
2015-01-07 | 0.862 ppm |
2015-02-10 | 0.819 ppm |
2015-02-10 | 0.807 ppm |
2015-02-10 | 0.818 ppm |
2015-02-10 | 0.824 ppm |
2015-02-10 | 0.810 ppm |
2015-03-10 | 0.841 ppm |
2015-03-10 | 0.842 ppm |
2015-03-10 | 0.866 ppm |
2015-03-10 | 0.851 ppm |
2015-03-10 | 0.841 ppm |
2015-03-10 | 0.706 ppm |
2015-03-10 | 0.842 ppm |
2015-03-10 | 0.866 ppm |
2015-03-10 | 0.842 ppm |
2015-03-10 | 0.842 ppm |
2015-03-10 | 0.851 ppm |
2015-05-19 | 0.690 ppm |
2015-05-19 | 0.867 ppm |
2015-05-19 | 0.899 ppm |
2015-05-19 | 0.879 ppm |
2015-05-19 | 0.870 ppm |
2015-05-19 | 0.873 ppm |
2015-06-04 | 0.904 ppm |
2015-06-04 | 0.913 ppm |
2015-06-04 | 0.716 ppm |
2015-06-04 | 0.935 ppm |
2015-06-04 | 0.912 ppm |
2015-06-04 | 0.902 ppm |
2015-07-02 | 0.902 ppm |
2015-07-02 | 0.912 ppm |
2015-07-02 | 0.903 ppm |
2015-07-02 | 0.904 ppm |
2015-07-02 | 1.43 ppm |
2015-08-12 | 0.861 ppm |
2015-08-12 | 0.998 ppm |
2015-08-12 | 1.02 ppm |
2015-08-12 | 0.986 ppm |
2015-08-12 | 1.02 ppm |
2015-08-12 | 1.01 ppm |
2015-12-09 | 0.822 ppm |
2015-12-09 | 0.719 ppm |
2015-12-09 | 0.837 ppm |
2015-12-09 | 0.830 ppm |
2015-12-09 | 0.842 ppm |
2015-12-09 | 0.838 ppm |
2016-01-13 | 0.786 ppm |
2016-01-13 | 0.770 ppm |
2016-01-13 | 0.783 ppm |
2016-01-13 | 0.782 ppm |
2016-01-13 | 0.710 ppm |
2016-02-11 | 0.752 ppm |
2016-02-11 | 0.756 ppm |
2016-02-11 | 0.754 ppm |
2016-02-11 | 0.762 ppm |
2016-03-10 | 0.807 ppm |
2016-03-10 | 0.676 ppm |
2016-03-10 | 0.827 ppm |
2016-03-10 | 0.809 ppm |
2016-03-10 | 0.785 ppm |
2016-04-13 | 0.830 ppm |
2016-04-13 | 0.833 ppm |
2016-04-13 | 0.824 ppm |
2016-04-13 | 0.813 ppm |
2016-05-11 | 0.874 ppm |
2016-05-11 | 0.852 ppm |
2016-05-11 | 0.898 ppm |
2016-05-11 | 0.727 ppm |
2016-05-11 | 0.898 ppm |
2016-06-15 | 0.756 ppm |
2016-06-15 | 0.941 ppm |
2016-06-15 | 0.943 ppm |
2016-06-15 | 0.954 ppm |
2016-06-15 | 0.962 ppm |
2016-07-13 | 0.711 ppm |
2016-07-13 | 0.873 ppm |
2016-07-13 | 0.811 ppm |
2016-07-13 | 0.832 ppm |
2016-07-13 | 0.600 ppm |
2016-07-13 | 0.846 ppm |
2016-09-15 | 0.856 ppm |
2016-09-15 | ND |
2016-09-15 | 0.866 ppm |
2016-09-15 | 0.863 ppm |
2016-09-15 | 0.858 ppm |
2016-12-14 | 0.816 ppm |
2016-12-14 | 0.624 ppm |
2016-12-14 | 0.786 ppm |
2016-12-14 | 0.796 ppm |
2016-12-14 | 0.783 ppm |
2017-04-12 | 0.907 ppm |
2017-04-12 | 0.907 ppm |
2017-10-11 | 0.859 ppm |
2017-10-11 | 0.868 ppm |
2017-10-11 | 0.873 ppm |
2017-10-11 | 0.862 ppm |
2017-10-11 | 0.583 ppm |
2017-10-11 | 0.864 ppm |
2017-11-14 | 0.926 ppm |
2017-11-14 | 0.919 ppm |
2017-11-14 | 0.662 ppm |
2017-11-14 | 0.922 ppm |
2017-11-14 | 0.922 ppm |
2017-11-14 | 0.926 ppm |
2017-12-13 | 0.801 ppm |
2017-12-13 | 0.649 ppm |
2017-12-13 | 0.798 ppm |
2017-12-13 | 0.803 ppm |
2017-12-13 | 0.800 ppm |
2017-12-13 | 0.799 ppm |
2018-02-14 | 0.839 ppm |
2018-02-14 | 0.832 ppm |
2018-02-14 | 0.836 ppm |
2018-02-14 | 0.653 ppm |
2018-02-14 | 0.829 ppm |
2018-02-14 | 0.832 ppm |
2018-03-07 | 0.654 ppm |
2018-03-07 | 0.831 ppm |
2018-03-07 | 0.838 ppm |
2018-03-07 | 0.834 ppm |
2018-03-07 | 0.835 ppm |
2018-03-07 | 0.831 ppm |
2018-04-04 | 0.859 ppm |
2018-04-04 | 0.693 ppm |
2018-04-04 | 0.856 ppm |
2018-04-04 | 0.855 ppm |
2018-04-04 | 0.854 ppm |
2018-04-04 | 0.852 ppm |
2018-05-03 | 0.801 ppm |
2018-05-03 | 0.807 ppm |
2018-05-03 | 0.805 ppm |
2018-05-03 | 0.809 ppm |
2018-05-03 | 0.804 ppm |
2018-07-10 | 0.988 ppm |
2018-07-10 | 0.998 ppm |
2018-07-10 | 1.000 ppm |
2018-07-10 | 1.01 ppm |
2018-07-10 | 0.998 ppm |
2018-08-08 | 0.637 ppm |
2018-08-08 | 0.653 ppm |
2018-08-08 | 0.657 ppm |
2018-08-08 | 0.666 ppm |
2018-08-08 | 0.689 ppm |
2018-08-12 | 0.812 ppm |
2018-09-12 | 0.810 ppm |
2018-09-12 | 0.805 ppm |
2018-09-12 | 0.802 ppm |
2018-09-12 | 0.812 ppm |
2018-09-12 | 0.809 ppm |
2018-09-12 | 0.810 ppm |
2018-09-12 | 0.200 ppm |
2018-09-12 | 0.802 ppm |
2018-09-12 | 0.805 ppm |
2018-10-10 | 0.684 ppm |
2018-10-10 | 0.689 ppm |
2018-10-10 | 0.685 ppm |
2018-10-10 | 0.686 ppm |
2018-10-10 | 0.689 ppm |
2019-10-14 | 0.708 ppm |
2019-10-14 | 0.708 ppm |
2019-10-14 | 0.699 ppm |