Fluoride
Chickasha Municipal Authority
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 |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | N/A | 0 | 0 | N/A |
2015 | 0.667 ppm | 5 | 5 | 0.536 ppm - 0.787 ppm |
2016 | 0.858 ppm | 12 | 12 | 0.220 ppm - 1.32 ppm |
2017 | 0.666 ppm | 11 | 11 | 0.530 ppm - 0.846 ppm |
2018 | 0.673 ppm | 12 | 12 | 0.570 ppm - 0.760 ppm |
2019 | 0.417 ppm | 12 | 12 | 0.210 ppm - 0.640 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 |
---|---|---|
2015-08-25 | 1421948 | 0.770 ppm |
2015-09-16 | 1427957 | 0.536 ppm |
2015-10-06 | 1432959 | 0.700 ppm |
2015-11-11 | 1443325 | 0.544 ppm |
2015-12-16 | 1452278 | 0.787 ppm |
2016-01-13 | 1458392 | 1.20 ppm |
2016-02-10 | 1466878 | 0.640 ppm |
2016-03-09 | 1473367 | 0.836 ppm |
2016-04-13 | 1482509 | 0.884 ppm |
2016-05-18 | 1492587 | 0.560 ppm |
2016-06-22 | 1501674 | 0.944 ppm |
2016-07-20 | 1509152 | 0.911 ppm |
2016-08-10 | 1514959 | 1.000 ppm |
2016-09-14 | 1524684 | 0.778 ppm |
2016-10-19 | 1534739 | 1.32 ppm |
2016-11-16 | 1541851 | 0.220 ppm |
2016-12-08 | 1547062 | 1.000 ppm |
2017-01-04 | 1552917 | 0.846 ppm |
2017-02-08 | 1562368 | 0.608 ppm |
2017-03-08 | 1570067 | 0.782 ppm |
2017-04-12 | 1579239 | 0.650 ppm |
2017-05-10 | 1587231 | 0.655 ppm |
2017-06-07 | 1594468 | 0.665 ppm |
2017-07-19 | 1605968 | 0.615 ppm |
2017-08-09 | 1612118 | 0.530 ppm |
2017-09-13 | 1621863 | 0.585 ppm |
2017-11-15 | 1639213 | 0.740 ppm |
2017-12-06 | 1644169 | 0.645 ppm |
2018-01-23 | 1655622 | 0.750 ppm |
2018-02-14 | AB14109-01 | 0.730 ppm |
2018-03-14 | AC14067-02 | 0.760 ppm |
2018-04-18 | AD18068-01 | 0.720 ppm |
2018-05-23 | AE23042-02 | 0.700 ppm |
2018-06-27 | AF27156-02 | 0.750 ppm |
2018-07-25 | AG25127-02 | 0.580 ppm |
2018-08-22 | AH22082-02 | 0.640 ppm |
2018-09-26 | AI26152-02 | 0.660 ppm |
2018-10-24 | AJ24024-02 | 0.640 ppm |
2018-11-28 | AK28060-02 | 0.570 ppm |
2018-12-18 | AL19029-02 | 0.580 ppm |
2019-01-23 | BA23054-02 | 0.620 ppm |
2019-02-20 | BB20049-02 | 0.450 ppm |
2019-03-27 | BC27037-02 | 0.640 ppm |
2019-04-17 | BD17049-02 | 0.570 ppm |
2019-05-29 | BE29027-02 | 0.560 ppm |
2019-06-26 | BF26129-02 | 0.440 ppm |
2019-07-24 | BG24062-06 | 0.480 ppm |
2019-08-21 | BH21135-02 | 0.240 ppm |
2019-09-25 | BI25059-02 | 0.300 ppm |
2019-10-30 | BJ30069-02 | 0.260 ppm |
2019-11-06 | BK06139-01 | 0.210 ppm |
2019-12-11 | BL11158-01 | 0.230 ppm |