Fluoride
Grand Prairie Regional Water
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.798 ppm | 24 | 24 | 0.470 ppm - 1.08 ppm |
| 2015 | 0.914 ppm | 16 | 16 | 0.570 ppm - 1.37 ppm |
| 2016 | 0.843 ppm | 18 | 18 | 0.510 ppm - 1.08 ppm |
| 2017 | 0.647 ppm | 20 | 17 | ND - 1.10 ppm |
| 2018 | 0.897 ppm | 24 | 24 | 0.700 ppm - 1.17 ppm |
| 2019 | 0.890 ppm | 24 | 24 | 0.630 ppm - 1.32 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 |
|---|---|---|
| 2014-01-15 | 140160041 | 0.690 ppm |
| 2014-01-15 | 140160040 | 0.970 ppm |
| 2014-02-10 | 140550009 | 0.960 ppm |
| 2014-02-10 | 140550011 | 0.760 ppm |
| 2014-03-05 | 140690008 | 0.880 ppm |
| 2014-03-05 | 140690009 | 0.950 ppm |
| 2014-04-07 | 141040006 | 0.670 ppm |
| 2014-04-07 | 141040005 | 0.920 ppm |
| 2014-05-12 | 141390008 | 0.470 ppm |
| 2014-05-12 | 141390007 | 0.470 ppm |
| 2014-06-09 | 141670011 | 0.930 ppm |
| 2014-06-09 | 141670010 | 0.960 ppm |
| 2014-07-01 | 141880011 | 0.900 ppm |
| 2014-07-01 | 141880012 | 0.550 ppm |
| 2014-08-13 | 142300004 | 0.690 ppm |
| 2014-08-13 | 142300031 | 1.03 ppm |
| 2014-09-08 | 142580028 | 1.08 ppm |
| 2014-09-08 | 142580029 | 0.580 ppm |
| 2014-10-20 | Y143000026 | 0.780 ppm |
| 2014-10-20 | Y143000025 | 0.790 ppm |
| 2014-11-04 | Y143110014 | 0.860 ppm |
| 2014-11-04 | Y143110013 | 0.700 ppm |
| 2014-12-10 | Y143490037 | 0.830 ppm |
| 2014-12-10 | Y143490036 | 0.740 ppm |
| 2015-01-20 | Y150260020 | 0.740 ppm |
| 2015-01-20 | Y150260019 | 0.910 ppm |
| 2015-03-11 | Y150750033 | 0.840 ppm |
| 2015-03-11 | Y150750034 | 0.830 ppm |
| 2015-04-13 | Y151110040 | 1.16 ppm |
| 2015-04-13 | Y151110039 | 0.570 ppm |
| 2015-05-13 | Y151340033 | 0.580 ppm |
| 2015-05-13 | Y151340032 | 0.740 ppm |
| 2015-06-03 | Y151550063 | 0.710 ppm |
| 2015-06-03 | Y151550064 | 1.19 ppm |
| 2015-08-03 | Y152180003 | 0.640 ppm |
| 2015-08-03 | Y152180002 | 1.29 ppm |
| 2015-10-12 | Y152890037 | 1.31 ppm |
| 2015-10-12 | Y152890038 | 0.900 ppm |
| 2015-11-02 | Y153130003 | 1.37 ppm |
| 2015-11-02 | Y153130011 | 0.840 ppm |
| 2016-01-11 | Y160120019 | 0.890 ppm |
| 2016-01-11 | Y160120020 | 0.510 ppm |
| 2016-02-10 | Y160530001 | 0.760 ppm |
| 2016-02-10 | Y160530002 | 1.01 ppm |
| 2016-03-14 | Y160810021 | 0.760 ppm |
| 2016-03-14 | Y160810022 | 0.990 ppm |
| 2016-04-25 | Y161240007 | 1.07 ppm |
| 2016-04-25 | Y161240008 | 0.660 ppm |
| 2016-06-17 | Y161790012 | 1.08 ppm |
| 2016-06-27 | Y161870040 | 0.910 ppm |
| 2016-07-19 | Y162070020 | 0.900 ppm |
| 2016-07-26 | Y162100015 | 0.870 ppm |
| 2016-07-26 | Y162100016 | 0.710 ppm |
| 2016-07-27 | Y162210014 | 0.760 ppm |
| 2016-08-15 | Y162350011 | 0.930 ppm |
| 2016-08-15 | Y162350027 | 0.700 ppm |
| 2016-12-29 | Y163650001 | 0.840 ppm |
| 2016-12-29 | Y163650002 | 0.830 ppm |
| 2017-01-28 | Y170350022 | 0.840 ppm |
| 2017-01-28 | Y170350023 | 0.730 ppm |
| 2017-02-24 | Y170580026 | 0.780 ppm |
| 2017-02-24 | Y170580027 | 0.820 ppm |
| 2017-06-29 | Y171840096 | ND |
| 2017-06-29 | Y171840097 | ND |
| 2017-07-17 | Y172050042 | ND |
| 2017-07-17 | Y172050043 | 0.670 ppm |
| 2017-07-27 | Y172120029 | 0.400 ppm |
| 2017-07-27 | Y172120030 | 0.570 ppm |
| 2017-08-29 | Y172480003 | 0.640 ppm |
| 2017-08-29 | Y172480004 | 0.650 ppm |
| 2017-09-21 | Y172680033 | 0.700 ppm |
| 2017-09-21 | Y172680034 | 0.480 ppm |
| 2017-10-31 | Y173100003 | 0.820 ppm |
| 2017-10-31 | Y173100004 | 0.980 ppm |
| 2017-11-28 | Y173380015 | 0.980 ppm |
| 2017-11-28 | Y173380016 | 0.780 ppm |
| 2017-12-20 | Y173610027 | 0.990 ppm |
| 2017-12-20 | Y173610028 | 1.10 ppm |
| 2018-01-23 | Y180240006 | 0.950 ppm |
| 2018-01-23 | Y180240007 | 1.14 ppm |
| 2018-02-27 | Y180590008 | 0.840 ppm |
| 2018-02-27 | Y180590009 | 1.08 ppm |
| 2018-03-29 | Y180920021 | 0.930 ppm |
| 2018-03-29 | Y180920020 | 0.880 ppm |
| 2018-04-24 | Y181220003 | 0.860 ppm |
| 2018-04-24 | Y181220002 | 0.920 ppm |
| 2018-05-16 | Y181410019 | 0.760 ppm |
| 2018-05-16 | Y181410018 | 0.880 ppm |
| 2018-06-20 | Y181760072 | 0.950 ppm |
| 2018-06-20 | Y181760071 | 0.960 ppm |
| 2018-07-10 | Y181970020 | 0.700 ppm |
| 2018-07-10 | Y181970019 | 0.900 ppm |
| 2018-08-24 | Y182400032 | 0.830 ppm |
| 2018-08-24 | Y182400033 | 1.17 ppm |
| 2018-09-25 | Y182750005 | 0.950 ppm |
| 2018-09-25 | Y182750004 | 0.780 ppm |
| 2018-10-17 | Y182950013 | 0.860 ppm |
| 2018-10-24 | Y183020007 | 0.770 ppm |
| 2018-11-19 | Y183300008 | 0.830 ppm |
| 2018-11-26 | Y183370001 | 0.890 ppm |
| 2018-12-10 | Y183510018 | 0.850 ppm |
| 2018-12-19 | Y183600007 | 0.850 ppm |
| 2019-01-08 | Y190140022 | 0.870 ppm |
| 2019-01-29 | Y190350009 | 0.940 ppm |
| 2019-02-20 | Y190560026 | 0.930 ppm |
| 2019-02-20 | Y190560025 | 0.810 ppm |
| 2019-03-26 | Y190910009 | 0.780 ppm |
| 2019-03-26 | Y190910010 | 0.860 ppm |
| 2019-05-15 | Y191400034 | 0.710 ppm |
| 2019-05-15 | Y191400035 | 0.760 ppm |
| 2019-06-19 | Y191750007 | 0.850 ppm |
| 2019-06-19 | Y191750008 | 0.690 ppm |
| 2019-07-23 | Y192100027 | 1.03 ppm |
| 2019-07-23 | Y192100026 | 1.04 ppm |
| 2019-08-23 | Y192380014 | 0.730 ppm |
| 2019-08-23 | Y192380013 | 0.790 ppm |
| 2019-08-26 | Y192410013 | 0.770 ppm |
| 2019-08-26 | Y192410012 | 0.940 ppm |
| 2019-09-27 | Y192820012 | 0.820 ppm |
| 2019-09-27 | Y192820011 | 1.24 ppm |
| 2019-10-29 | Y193100004 | 1.32 ppm |
| 2019-10-29 | Y193100003 | 0.820 ppm |
| 2019-11-25 | Y193370008 | 0.630 ppm |
| 2019-11-25 | Y193370009 | 1.12 ppm |
| 2019-12-04 | Y193430029 | 1.27 ppm |
| 2019-12-04 | Y193430030 | 0.650 ppm |