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EWG's Tap Water Database — 2021 UPDATE

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Fluoride

Nashville Water Department #1

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.

 

203

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.381 ppm33330.0380 ppm - 0.843 ppm
20150.447 ppm33330.00500 ppm - 0.736 ppm
20160.618 ppm36360.518 ppm - 0.723 ppm
20170.616 ppm32320.0680 ppm - 0.715 ppm
20180.631 ppm36360.513 ppm - 0.765 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
2014-01-080.0620 ppm
2014-01-080.562 ppm
2014-01-080.601 ppm
2014-02-110.0380 ppm
2014-02-110.718 ppm
2014-02-110.629 ppm
2014-03-110.0420 ppm
2014-03-110.317 ppm
2014-03-110.617 ppm
2014-04-160.0650 ppm
2014-04-160.644 ppm
2014-04-160.653 ppm
2014-05-140.0480 ppm
2014-05-140.602 ppm
2014-05-140.784 ppm
2014-06-230.0610 ppm
2014-06-230.843 ppm
2014-06-230.692 ppm
2014-08-130.0740 ppm
2014-08-130.837 ppm
2014-08-130.365 ppm
2014-09-090.0650 ppm
2014-09-090.788 ppm
2014-09-090.0740 ppm
2014-10-140.0520 ppm
2014-10-140.645 ppm
2014-10-140.0630 ppm
2014-11-110.0590 ppm
2014-11-110.0800 ppm
2014-11-110.709 ppm
2014-12-090.0600 ppm
2014-12-090.633 ppm
2014-12-090.0930 ppm
2015-01-130.00500 ppm
2015-01-130.573 ppm
2015-01-130.596 ppm
2015-03-100.0350 ppm
2015-03-100.294 ppm
2015-03-100.659 ppm
2015-04-150.00500 ppm
2015-04-150.736 ppm
2015-04-150.435 ppm
2015-05-120.0340 ppm
2015-05-120.541 ppm
2015-05-120.697 ppm
2015-06-090.0540 ppm
2015-06-090.696 ppm
2015-06-090.681 ppm
2015-07-150.383 ppm
2015-07-150.651 ppm
2015-07-150.641 ppm
2015-08-110.528 ppm
2015-08-110.554 ppm
2015-08-110.527 ppm
2015-09-080.602 ppm
2015-09-080.686 ppm
2015-09-080.599 ppm
2015-10-130.498 ppm
2015-10-130.540 ppm
2015-10-130.0500 ppm
2015-11-100.595 ppm
2015-11-100.596 ppm
2015-11-100.0570 ppm
2015-12-080.583 ppm
2015-12-080.0450 ppm
2015-12-080.582 ppm
2016-01-120.618 ppm
2016-01-120.569 ppm
2016-01-120.614 ppm
2016-02-090.585 ppm
2016-02-090.629 ppm
2016-02-090.598 ppm
2016-03-020.518 ppm
2016-03-020.616 ppm
2016-03-020.565 ppm
2016-04-120.586 ppm
2016-04-120.590 ppm
2016-04-120.590 ppm
2016-05-100.610 ppm
2016-05-100.664 ppm
2016-05-100.636 ppm
2016-06-140.600 ppm
2016-06-140.660 ppm
2016-06-140.692 ppm
2016-07-120.584 ppm
2016-07-120.688 ppm
2016-07-120.664 ppm
2016-08-080.607 ppm
2016-08-080.682 ppm
2016-08-080.723 ppm
2016-09-130.608 ppm
2016-09-130.630 ppm
2016-09-130.715 ppm
2016-10-120.589 ppm
2016-10-120.602 ppm
2016-10-120.682 ppm
2016-11-070.645 ppm
2016-11-070.631 ppm
2016-11-070.610 ppm
2016-12-130.527 ppm
2016-12-130.564 ppm
2016-12-130.550 ppm
2017-01-190.590 ppm
2017-01-190.574 ppm
2017-01-190.621 ppm
2017-02-140.612 ppm
2017-02-140.626 ppm
2017-02-140.620 ppm
2017-03-150.615 ppm
2017-03-150.623 ppm
2017-03-150.622 ppm
2017-04-120.654 ppm
2017-04-120.701 ppm
2017-04-120.715 ppm
2017-05-100.638 ppm
2017-05-100.666 ppm
2017-05-100.0680 ppm
2017-06-070.574 ppm
2017-06-070.659 ppm
2017-06-070.705 ppm
2017-07-120.603 ppm
2017-07-120.667 ppm
2017-07-120.690 ppm
2017-08-230.628 ppm
2017-08-230.614 ppm
2017-09-250.608 ppm
2017-09-250.624 ppm
2017-09-250.624 ppm
2017-10-240.641 ppm
2017-10-240.650 ppm
2017-10-240.618 ppm
2017-11-140.640 ppm
2017-11-140.612 ppm
2017-11-140.604 ppm
2018-01-180.538 ppm
2018-01-180.513 ppm
2018-01-180.524 ppm
2018-02-130.756 ppm
2018-02-130.642 ppm
2018-02-130.636 ppm
2018-03-190.638 ppm
2018-03-190.612 ppm
2018-03-190.618 ppm
2018-04-230.610 ppm
2018-04-230.627 ppm
2018-04-230.621 ppm
2018-05-230.609 ppm
2018-05-230.611 ppm
2018-05-230.610 ppm
2018-06-210.587 ppm
2018-06-210.658 ppm
2018-06-210.665 ppm
2018-07-190.611 ppm
2018-07-190.709 ppm
2018-07-190.672 ppm
2018-08-220.765 ppm
2018-08-220.702 ppm
2018-08-220.682 ppm
2018-09-240.650 ppm
2018-09-240.678 ppm
2018-09-240.622 ppm
2018-10-220.611 ppm
2018-10-220.611 ppm
2018-10-220.654 ppm
2018-11-260.620 ppm
2018-11-260.684 ppm
2018-11-260.606 ppm
2018-12-100.572 ppm
2018-12-100.590 ppm
2018-12-100.606 ppm
2019-01-150.605 ppm
2019-01-150.519 ppm
2019-01-150.516 ppm
2019-02-190.638 ppm
2019-02-190.494 ppm
2019-02-190.543 ppm
2019-03-190.613 ppm
2019-03-190.611 ppm
2019-03-190.525 ppm
2019-04-150.604 ppm
2019-04-150.654 ppm
2019-04-150.652 ppm
2019-05-230.585 ppm
2019-05-230.689 ppm
2019-05-230.696 ppm
2019-07-220.686 ppm
2019-07-220.765 ppm
2019-07-220.747 ppm
2019-08-140.682 ppm
2019-08-140.752 ppm
2019-08-140.688 ppm
2019-09-230.707 ppm
2019-09-230.813 ppm
2019-09-230.702 ppm
2019-10-230.690 ppm
2019-10-230.680 ppm
2019-10-230.690 ppm
2019-11-180.590 ppm
2019-11-180.560 ppm
2019-11-180.580 ppm
2019-12-180.634 ppm
2019-12-180.602 ppm
2019-12-180.576 ppm