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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

Port Washington Waterworks

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.

 

150

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.06 ppm25250.880 ppm - 1.21 ppm
20130.755 ppm25250.640 ppm - 1.10 ppm
20140.666 ppm25250.543 ppm - 0.790 ppm
20150.621 ppm25250.439 ppm - 0.760 ppm
20160.602 ppm25250.454 ppm - 0.830 ppm
20170.654 ppm25250.510 ppm - 0.890 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
2012-01-12IW0117671.08 ppm
2012-01-12IW0117671.14 ppm
2012-02-06IW0123011.10 ppm
2012-02-06IW0123011.21 ppm
2012-03-07IW0135571.04 ppm
2012-03-07IW0135571.09 ppm
2012-04-03IW0147921.01 ppm
2012-04-03IW0147921.06 ppm
2012-04-252630415-161.000 ppm
2012-05-09IW0177541.01 ppm
2012-05-09IW0177541.19 ppm
2012-06-01IW0196641.01 ppm
2012-06-01IW0196641.10 ppm
2012-07-09IX0005051.04 ppm
2012-07-09IX0005051.06 ppm
2012-08-01IX0030540.880 ppm
2012-08-01IX0030541.02 ppm
2012-09-10IX0067420.950 ppm
2012-09-10IX0067421.01 ppm
2012-10-10IX0097441.04 ppm
2012-10-10IX0097441.12 ppm
2012-11-06IX0111741.14 ppm
2012-11-06IX0111741.19 ppm
2012-12-03IX0123251.05 ppm
2012-12-03IX0123251.08 ppm
2013-01-08IX0137701.000 ppm
2013-01-08IX0137701.07 ppm
2013-02-05IX0147651.05 ppm
2013-02-05IX0147651.10 ppm
2013-03-11IX0164950.670 ppm
2013-03-11IX0164950.780 ppm
2013-04-15IX0188630.700 ppm
2013-04-15IX0188630.720 ppm
2013-04-222812648-490.700 ppm
2013-05-06712450010.657 ppm
2013-05-06712450010.690 ppm
2013-06-04769540010.659 ppm
2013-06-04769540010.740 ppm
2013-07-08837410010.675 ppm
2013-07-08837410010.810 ppm
2013-08-05901000010.730 ppm
2013-08-05901000010.736 ppm
2013-09-03949020010.653 ppm
2013-09-03949020010.740 ppm
2013-10-151044210010.653 ppm
2013-10-151044210010.710 ppm
2013-11-011069080010.640 ppm
2013-11-011069080010.651 ppm
2013-12-021111830010.642 ppm
2013-12-021111830010.710 ppm
2014-01-081154850010.676 ppm
2014-01-081154850010.760 ppm
2014-02-041185720010.586 ppm
2014-02-041185720010.780 ppm
2014-03-101229960010.623 ppm
2014-03-101229960010.790 ppm
2014-04-031260930010.640 ppm
2014-04-031260930010.710 ppm
2014-04-083004182-830.700 ppm
2014-05-071312180010.543 ppm
2014-05-071312180010.600 ppm
2014-06-031365730010.635 ppm
2014-06-031365730010.740 ppm
2014-07-081441150010.561 ppm
2014-07-081441150010.730 ppm
2014-08-121509460010.553 ppm
2014-08-121509460010.650 ppm
2014-09-031548770010.611 ppm
2014-09-031548770010.720 ppm
2014-10-071622340010.697 ppm
2014-10-071622340010.720 ppm
2014-11-041670330010.678 ppm
2014-11-041670330010.720 ppm
2014-12-021709700010.588 ppm
2014-12-021709700010.630 ppm
2015-01-051744550010.630 ppm
2015-01-051744550010.720 ppm
2015-02-041785810010.639 ppm
2015-02-041785810010.760 ppm
2015-03-051823020010.439 ppm
2015-03-051823020010.550 ppm
2015-04-061865110010.534 ppm
2015-04-061865110010.650 ppm
2015-04-073219659-600.600 ppm
2015-05-041910210010.600 ppm
2015-05-041910210010.660 ppm
2015-06-081981170010.605 ppm
2015-06-081981170010.690 ppm
2015-07-062042810010.571 ppm
2015-07-062042810010.640 ppm
2015-08-032094820010.564 ppm
2015-08-032094820010.690 ppm
2015-09-012149410010.604 ppm
2015-09-012149410010.630 ppm
2015-10-072226430010.621 ppm
2015-10-072226430010.690 ppm
2015-11-092280500010.601 ppm
2015-11-092280500010.620 ppm
2015-12-012308040010.599 ppm
2015-12-012308040010.630 ppm
2016-01-072350620010.621 ppm
2016-01-072350620010.690 ppm
2016-02-032382770010.558 ppm
2016-02-032382770010.660 ppm
2016-03-042422780010.552 ppm
2016-03-042422780010.600 ppm
2016-04-042472800010.682 ppm
2016-04-042472800010.830 ppm
2016-05-022519830010.524 ppm
2016-05-022519830010.580 ppm
2016-05-053443037-380.500 ppm
2016-06-012576860010.553 ppm
2016-06-012576860010.620 ppm
2016-07-112652290010.515 ppm
2016-07-112652290010.630 ppm
2016-08-022698180010.454 ppm
2016-08-022698180010.550 ppm
2016-09-122771200010.551 ppm
2016-09-122771200010.620 ppm
2016-10-052825320010.570 ppm
2016-10-052825320010.600 ppm
2016-11-022872520010.584 ppm
2016-11-022872520010.690 ppm
2016-12-062921400010.634 ppm
2016-12-062921400010.680 ppm
2017-01-032949020010.539 ppm
2017-01-032949020010.610 ppm
2017-02-022983350010.600 ppm
2017-02-022983350010.680 ppm
2017-03-073031700010.595 ppm
2017-03-073031700010.670 ppm
2017-04-033075740010.623 ppm
2017-04-033075740010.730 ppm
2017-04-193677792-930.610 ppm
2017-05-013131030010.640 ppm
2017-05-013131030010.750 ppm
2017-06-013190690010.601 ppm
2017-06-013190690010.700 ppm
2017-07-103273090010.510 ppm
2017-07-103273090010.590 ppm
2017-08-033334010010.601 ppm
2017-08-033334010010.700 ppm
2017-09-053404950010.646 ppm
2017-09-053404950010.670 ppm
2017-10-033465020010.650 ppm
2017-10-033465020010.655 ppm
2017-11-073535210010.697 ppm
2017-11-073535210010.890 ppm
2017-12-053579350010.623 ppm
2017-12-053579350010.760 ppm