Fluoride
Las Flores Water Company
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.
147
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.693 ppm | 24 | 24 | 0.550 ppm - 0.850 ppm |
| 2015 | 0.675 ppm | 23 | 23 | 0.570 ppm - 0.830 ppm |
| 2016 | 0.670 ppm | 25 | 25 | 0.530 ppm - 0.840 ppm |
| 2017 | 0.655 ppm | 25 | 25 | 0.540 ppm - 0.800 ppm |
| 2018 | 0.675 ppm | 23 | 23 | 0.570 ppm - 0.840 ppm |
| 2019 | 0.626 ppm | 27 | 27 | 0.510 ppm - 0.800 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 | Lab ID | Result |
|---|---|---|
| 2014-01-06 | 3761-003-0800 | 0.560 ppm |
| 2014-01-06 | 3761-005-0900 | 0.850 ppm |
| 2014-01-06 | 3761-006-0740 | 0.720 ppm |
| 2014-02-03 | 3761-003-0805 | 0.560 ppm |
| 2014-02-03 | 3761-006-0750 | 0.700 ppm |
| 2014-03-17 | 3761-003-0750 | 0.550 ppm |
| 2014-03-17 | 3761-006-0730 | 0.710 ppm |
| 2014-04-07 | 3761-003-0810 | 0.560 ppm |
| 2014-04-07 | 3761-006-0740 | 0.750 ppm |
| 2014-05-05 | 3761-003-0810 | 0.640 ppm |
| 2014-05-05 | 3761-006-0730 | 0.810 ppm |
| 2014-06-02 | 3761-003-0800 | 0.590 ppm |
| 2014-06-02 | 3761-006-0730 | 0.730 ppm |
| 2014-07-07 | 3761-003-0810 | 0.660 ppm |
| 2014-07-07 | 3761-006-0750 | 0.780 ppm |
| 2014-08-04 | 3761-003-0810 | 0.680 ppm |
| 2014-08-04 | 3761-006-0800 | 0.820 ppm |
| 2014-09-15 | 3761-003-0000 | 0.630 ppm |
| 2014-09-15 | 3761-006-0740 | 0.810 ppm |
| 2014-10-20 | 3761-003-0745 | 0.720 ppm |
| 2014-10-20 | 3761-006-0800 | 0.840 ppm |
| 2014-12-01 | 3761-003-0740 | 0.620 ppm |
| 2014-12-01 | 3761-006-0800 | 0.750 ppm |
| 2014-12-22 | 3761-003-0745 | 0.590 ppm |
| 2015-01-05 | 3761-003-0805 | 0.630 ppm |
| 2015-01-05 | 3761-006-0740 | 0.750 ppm |
| 2015-02-02 | 3761-003-1035 | 0.630 ppm |
| 2015-02-02 | 3761-006-1025 | 0.760 ppm |
| 2015-03-02 | 3761-003-1005 | 0.590 ppm |
| 2015-03-02 | 3761-005-0945 | 0.830 ppm |
| 2015-03-02 | 3761-006-0950 | 0.740 ppm |
| 2015-04-06 | 3761-003-0800 | 0.610 ppm |
| 2015-04-06 | 3761-006-0735 | 0.730 ppm |
| 2015-05-04 | 3761-003-0830 | 0.590 ppm |
| 2015-05-04 | 3761-006-0740 | 0.740 ppm |
| 2015-06-01 | 3761-003-0800 | 0.600 ppm |
| 2015-06-01 | 3761-006-0740 | 0.720 ppm |
| 2015-07-13 | 3761-003-0800 | 0.580 ppm |
| 2015-07-13 | 3761-006-0745 | 0.700 ppm |
| 2015-08-03 | 3761-003-0800 | 0.630 ppm |
| 2015-08-03 | 3761-006-0740 | 0.730 ppm |
| 2015-09-08 | 3761-003-0800 | 0.630 ppm |
| 2015-09-08 | 3761-006-0730 | 0.710 ppm |
| 2015-11-02 | 3761-003-0810 | 0.630 ppm |
| 2015-11-02 | 3761-006-0705 | 0.730 ppm |
| 2015-12-07 | 3761-003-0815 | 0.570 ppm |
| 2015-12-07 | 3761-006-0740 | 0.690 ppm |
| 2016-01-04 | 3761-003-0810 | 0.560 ppm |
| 2016-01-04 | 3761-006-0745 | 0.640 ppm |
| 2016-02-29 | 3761-003-1005 | 0.650 ppm |
| 2016-02-29 | 3761-006-1015 | 0.670 ppm |
| 2016-03-07 | 3761-003-0845 | 0.600 ppm |
| 2016-03-07 | 3761-006-0815 | 0.630 ppm |
| 2016-04-04 | 3761-003-0830 | 0.530 ppm |
| 2016-04-04 | 3761-006-0750 | 0.580 ppm |
| 2016-05-02 | 3761-003-0815 | 0.690 ppm |
| 2016-05-02 | 3761-006-0750 | 0.840 ppm |
| 2016-06-06 | 3761-003-0825 | 0.710 ppm |
| 2016-06-06 | 3761-006-0900 | 0.800 ppm |
| 2016-07-05 | 3761-003-1000 | 0.740 ppm |
| 2016-07-05 | 3761-006-0825 | 0.790 ppm |
| 2016-08-01 | 3761-003-0845 | 0.640 ppm |
| 2016-08-01 | 3761-006-0905 | 0.690 ppm |
| 2016-09-26 | 3761-003-0800 | 0.690 ppm |
| 2016-09-26 | 3761-006-0915 | 0.720 ppm |
| 2016-10-03 | 3761-003-0910 | 0.610 ppm |
| 2016-10-03 | 3761-006-0930 | 0.670 ppm |
| 2016-10-17 | 3761-003-0825 | 0.650 ppm |
| 2016-11-07 | 3761-003-0800 | 0.620 ppm |
| 2016-11-07 | 3761-006-0810 | 0.710 ppm |
| 2016-12-05 | 3761-003-0755 | 0.600 ppm |
| 2016-12-05 | 3761-006-0735 | 0.710 ppm |
| 2017-01-03 | 3761-003-0845 | 0.600 ppm |
| 2017-01-03 | 3761-006-0915 | 0.700 ppm |
| 2017-01-09 | 3761-003-0810 | 0.590 ppm |
| 2017-01-09 | 3761-006-0810 | 0.680 ppm |
| 2017-02-06 | 3761-003-0850 | 0.660 ppm |
| 2017-02-06 | 3761-006-0955 | 0.700 ppm |
| 2017-04-17 | 3761-003-0815 | 0.750 ppm |
| 2017-04-17 | 3761-006-0820 | 0.770 ppm |
| 2017-05-01 | 3761-003-0810 | 0.700 ppm |
| 2017-05-01 | 3761-006-0930 | 0.800 ppm |
| 2017-06-05 | 3761-003-0800 | 0.630 ppm |
| 2017-06-05 | 3761-006-0840 | 0.690 ppm |
| 2017-07-03 | 3761-003-0750 | 0.540 ppm |
| 2017-07-03 | 3761-006-0805 | 0.650 ppm |
| 2017-08-07 | 3761-003-0830 | 0.560 ppm |
| 2017-08-07 | 3761-006-0730 | 0.650 ppm |
| 2017-09-05 | 3761-003-0820 | 0.560 ppm |
| 2017-09-05 | 3761-006-0750 | 0.680 ppm |
| 2017-10-02 | 3761-003-0600 | 0.570 ppm |
| 2017-10-02 | 3761-006-0615 | 0.700 ppm |
| 2017-11-06 | 3761-003-0635 | 0.590 ppm |
| 2017-11-06 | 3761-006-0535 | 0.690 ppm |
| 2017-12-04 | 3761-003-0545 | 0.550 ppm |
| 2017-12-04 | 3761-005-0530 | 0.720 ppm |
| 2017-12-04 | 3761-006-0530 | 0.640 ppm |
| 2018-01-02 | 3761-003-0630 | 0.610 ppm |
| 2018-01-02 | 3761-005-0540 | 0.780 ppm |
| 2018-01-02 | 3761-006-0530 | 0.700 ppm |
| 2018-02-05 | 3761-003-0805 | 0.590 ppm |
| 2018-02-05 | 3761-006-0815 | 0.640 ppm |
| 2018-03-05 | 3761-003-0945 | 0.640 ppm |
| 2018-03-05 | 3761-006-0930 | 0.730 ppm |
| 2018-04-02 | 3761-003-0845 | 0.630 ppm |
| 2018-04-02 | 3761-005-0910 | 0.840 ppm |
| 2018-04-02 | 3761-006-0900 | 0.710 ppm |
| 2018-05-07 | 3761-003-0821 | 0.670 ppm |
| 2018-05-07 | 3761-006-0910 | 0.710 ppm |
| 2018-06-04 | 3761-003-0900 | 0.580 ppm |
| 2018-06-04 | 3761-006-0930 | 0.670 ppm |
| 2018-07-03 | 3761-003-0600 | 0.570 ppm |
| 2018-07-03 | 3761-006-0620 | 0.680 ppm |
| 2018-09-04 | 3761-003-0900 | 0.610 ppm |
| 2018-09-04 | 3761-006-0920 | 0.750 ppm |
| 2018-10-01 | 9590-003-1300 | 0.640 ppm |
| 2018-10-01 | 9590-006-1245 | 0.740 ppm |
| 2018-12-03 | 3761-003-0900 | 0.590 ppm |
| 2018-12-03 | 3761-006-0930 | 0.750 ppm |
| 2018-12-19 | 3761-003-0900 | 0.700 ppm |
| 2019-01-07 | 3761-003-0900 | 0.550 ppm |
| 2019-01-07 | 3761-006-0920 | 0.680 ppm |
| 2019-02-04 | 3761-003-0930 | 0.670 ppm |
| 2019-02-04 | 3761-006-0945 | 0.800 ppm |
| 2019-03-04 | 3761-003-1000 | 0.610 ppm |
| 2019-03-04 | 3761-005-1040 | 0.660 ppm |
| 2019-03-04 | 3761-006-1030 | 0.640 ppm |
| 2019-04-01 | 3761-003-0800 | 0.620 ppm |
| 2019-04-01 | 3761-006-0820 | 0.710 ppm |
| 2019-05-06 | 3761-003-0800 | 0.560 ppm |
| 2019-05-06 | 3761-006-0820 | 0.630 ppm |
| 2019-06-03 | 3761-003-0630 | 0.570 ppm |
| 2019-06-03 | 3761-006-0645 | 0.730 ppm |
| 2019-07-01 | 3761-003-0900 | 0.520 ppm |
| 2019-07-01 | 3761-006-0920 | 0.700 ppm |
| 2019-08-05 | 3761-003-0745 | 0.540 ppm |
| 2019-08-05 | 3761-006-0800 | 0.690 ppm |
| 2019-09-03 | 3761-003-0715 | 0.530 ppm |
| 2019-09-03 | 3761-006-0730 | 0.620 ppm |
| 2019-10-07 | 3761-003-0720 | 0.510 ppm |
| 2019-10-07 | 3761-006-0730 | 0.650 ppm |
| 2019-11-04 | 3761-003-0900 | 0.580 ppm |
| 2019-11-04 | 3761-005-0845 | 0.710 ppm |
| 2019-11-04 | 3761-006-0915 | 0.690 ppm |
| 2019-12-02 | 3761-003-0900 | 0.520 ppm |
| 2019-12-02 | 3761-006-0915 | 0.650 ppm |
| 2019-12-09 | 3761-003-0930 | 0.570 ppm |