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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

California Water Service Company - Hermosa / Redondo Beach

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.

 

345

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.773 ppm60600.350 ppm - 0.910 ppm
20130.794 ppm71710.390 ppm - 0.920 ppm
20140.773 ppm51510.260 ppm - 1.01 ppm
20150.723 ppm55550.280 ppm - 1.01 ppm
20160.659 ppm54540.511 ppm - 0.858 ppm
20170.697 ppm54540.528 ppm - 0.772 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
2012-01-095810-008-14020.900 ppm
2012-01-095810-011-11200.890 ppm
2012-02-025810-008-09000.890 ppm
2012-02-025810-011-11270.900 ppm
2012-03-065810-008-08330.880 ppm
2012-03-065810-011-14350.840 ppm
2012-04-105810-008-08400.820 ppm
2012-04-105810-011-14540.790 ppm
2012-05-165810-008-09000.840 ppm
2012-05-165810-011-11200.830 ppm
2012-05-165810-800-10250.860 ppm
2012-05-165810-801-09460.860 ppm
2012-05-165810-802-09400.850 ppm
2012-05-165810-803-11300.610 ppm
2012-06-195810-008-08320.910 ppm
2012-06-195810-011-14290.840 ppm
2012-06-195810-804-08580.900 ppm
2012-06-215810-005-10350.350 ppm
2012-07-265810-008-08390.800 ppm
2012-07-265810-011-10500.790 ppm
2012-07-265810-800-09520.820 ppm
2012-07-265810-801-09180.770 ppm
2012-07-265810-802-09120.800 ppm
2012-07-265810-803-11010.470 ppm
2012-07-265810-804-09010.820 ppm
2012-08-145810-008-08510.750 ppm
2012-08-145810-011-14200.750 ppm
2012-08-145810-800-12040.750 ppm
2012-08-145810-801-10070.760 ppm
2012-08-145810-802-09530.770 ppm
2012-08-145810-803-14470.430 ppm
2012-08-145810-804-09230.800 ppm
2012-09-185810-008-08330.840 ppm
2012-09-185810-011-14290.830 ppm
2012-09-185810-800-12490.770 ppm
2012-09-185810-801-09350.820 ppm
2012-09-185810-802-09240.810 ppm
2012-09-185810-803-14480.500 ppm
2012-09-185810-804-08590.830 ppm
2012-10-165810-008-08360.810 ppm
2012-10-165810-011-14180.800 ppm
2012-10-165810-800-12130.820 ppm
2012-10-165810-801-09370.790 ppm
2012-10-165810-802-09270.800 ppm
2012-10-165810-803-14390.510 ppm
2012-10-165810-804-09020.780 ppm
2012-11-065810-008-08420.790 ppm
2012-11-065810-011-14450.780 ppm
2012-11-065810-800-13100.790 ppm
2012-11-065810-801-09400.800 ppm
2012-11-065810-802-09310.800 ppm
2012-11-065810-803-15030.510 ppm
2012-11-065810-804-09090.790 ppm
2012-12-045810-008-09060.800 ppm
2012-12-045810-011-13560.800 ppm
2012-12-045810-800-11010.790 ppm
2012-12-045810-801-09550.830 ppm
2012-12-045810-802-09430.840 ppm
2012-12-045810-803-14040.510 ppm
2012-12-045810-804-09230.810 ppm
2013-01-225810-008-08350.780 ppm
2013-01-225810-011-14040.760 ppm
2013-01-225810-800-12210.780 ppm
2013-01-225810-801-09500.780 ppm
2013-01-225810-802-09360.790 ppm
2013-01-225810-803-14290.470 ppm
2013-01-225810-804-09080.770 ppm
2013-02-075810-008-09090.800 ppm
2013-02-075810-011-11150.790 ppm
2013-02-075810-800-10280.740 ppm
2013-02-075810-801-09510.800 ppm
2013-02-075810-802-09450.800 ppm
2013-02-075810-803-11240.610 ppm
2013-02-075810-804-09310.810 ppm
2013-03-055810-008-08170.820 ppm
2013-03-055810-011-13560.790 ppm
2013-03-055810-800-11550.790 ppm
2013-03-055810-801-09150.830 ppm
2013-03-055810-802-09060.830 ppm
2013-03-055810-803-14140.520 ppm
2013-03-055810-804-08430.830 ppm
2013-04-045810-008-09390.880 ppm
2013-04-045810-011-11430.880 ppm
2013-04-045810-800-10550.830 ppm
2013-04-045810-801-10170.880 ppm
2013-04-045810-802-10120.870 ppm
2013-04-045810-803-12070.610 ppm
2013-04-045810-804-10010.880 ppm
2013-05-075810-008-08430.870 ppm
2013-05-075810-011-10000.870 ppm
2013-05-075810-800-12500.850 ppm
2013-05-075810-801-09360.870 ppm
2013-05-075810-802-09260.860 ppm
2013-05-075810-803-10350.610 ppm
2013-05-075810-804-09010.890 ppm
2013-06-115810-008-08400.900 ppm
2013-06-115810-011-14190.880 ppm
2013-06-115810-800-12350.910 ppm
2013-06-115810-801-09370.920 ppm
2013-06-115810-802-09280.920 ppm
2013-06-115810-803-14410.540 ppm
2013-06-115810-804-09060.880 ppm
2013-07-095810-008-08220.820 ppm
2013-07-095810-011-14200.820 ppm
2013-07-095810-800-12060.820 ppm
2013-07-095810-801-09290.830 ppm
2013-07-095810-802-09150.820 ppm
2013-07-095810-803-14400.460 ppm
2013-07-095810-804-08520.820 ppm
2013-08-065810-008-08320.810 ppm
2013-08-065810-011-14360.810 ppm
2013-08-065810-801-09310.810 ppm
2013-08-065810-804-09000.830 ppm
2013-09-105810-008-08510.850 ppm
2013-09-105810-011-14200.820 ppm
2013-09-105810-800-12420.820 ppm
2013-09-105810-802-09500.830 ppm
2013-09-105810-803-14430.410 ppm
2013-10-155810-008-08400.880 ppm
2013-10-155810-011-12530.870 ppm
2013-10-155810-801-09490.880 ppm
2013-10-155810-804-09110.880 ppm
2013-11-055810-008-08310.820 ppm
2013-11-055810-011-14100.810 ppm
2013-11-055810-800-12020.850 ppm
2013-11-055810-802-09190.830 ppm
2013-11-055810-803-14320.390 ppm
2013-12-035810-008-08250.800 ppm
2013-12-035810-011-14230.830 ppm
2013-12-035810-801-09280.810 ppm
2013-12-035810-804-08520.830 ppm
2014-01-095810-008-08520.820 ppm
2014-01-095810-011-11010.860 ppm
2014-01-095810-800-10090.800 ppm
2014-01-095810-802-09180.810 ppm
2014-01-095810-803-11290.500 ppm
2014-02-115810-008-08260.840 ppm
2014-02-115810-011-14110.860 ppm
2014-02-115810-801-09260.840 ppm
2014-02-115810-804-08560.810 ppm
2014-03-115810-008-08460.770 ppm
2014-04-085810-008-09040.860 ppm
2014-04-085810-011-14180.870 ppm
2014-04-085810-801-10000.880 ppm
2014-04-085810-804-09290.830 ppm
2014-05-135810-008-08410.790 ppm
2014-05-135810-011-14340.790 ppm
2014-05-135810-800-12540.800 ppm
2014-05-135810-802-09320.800 ppm
2014-05-135810-803-14550.260 ppm
2014-06-105810-008-08210.750 ppm
2014-06-105810-011-13580.760 ppm
2014-06-105810-801-09260.750 ppm
2014-06-105810-804-08540.760 ppm
2014-06-115810-001-10310.270 ppm
2014-07-085810-008-08280.770 ppm
2014-07-085810-011-14150.750 ppm
2014-07-085810-800-11590.760 ppm
2014-07-085810-802-09140.780 ppm
2014-07-085810-803-14350.350 ppm
2014-08-075701-008-13411.01 ppm
2014-08-075701-011-13180.930 ppm
2014-08-075701-801-11230.992 ppm
2014-08-075701-804-11350.898 ppm
2014-09-095701-008-08560.859 ppm
2014-09-095701-011-14240.838 ppm
2014-09-095701-800-12490.848 ppm
2014-09-095701-802-09490.885 ppm
2014-09-095701-803-14430.478 ppm
2014-10-145701-008-08500.777 ppm
2014-10-145701-011-14130.815 ppm
2014-10-145701-801-09500.789 ppm
2014-10-145701-804-09180.917 ppm
2014-11-045701-008-08260.676 ppm
2014-11-045701-011-14100.714 ppm
2014-11-045701-800-11500.779 ppm
2014-11-045701-802-09220.785 ppm
2014-11-045701-803-14310.430 ppm
2014-12-025701-008-09500.846 ppm
2014-12-025701-011-12460.870 ppm
2014-12-025701-801-10520.894 ppm
2014-12-025701-804-10140.898 ppm
2015-01-065701-008-08330.778 ppm
2015-01-065701-011-14350.930 ppm
2015-01-065701-800-12040.815 ppm
2015-01-065701-802-09340.928 ppm
2015-01-065701-803-15000.496 ppm
2015-02-105701-008-09030.837 ppm
2015-02-105701-011-14270.904 ppm
2015-02-105701-801-10050.940 ppm
2015-02-105701-804-09311.01 ppm
2015-03-105701-008-08500.837 ppm
2015-03-105701-011-14070.761 ppm
2015-03-105701-800-12020.767 ppm
2015-03-105701-802-09410.824 ppm
2015-03-105701-803-14270.482 ppm
2015-04-075701-008-08390.698 ppm
2015-04-075701-011-14080.804 ppm
2015-04-075701-801-09440.754 ppm
2015-04-075701-804-09110.751 ppm
2015-05-055701-008-08370.863 ppm
2015-05-055701-011-13480.811 ppm
2015-05-055701-800-11450.779 ppm
2015-05-055701-802-09300.844 ppm
2015-05-055701-803-14080.675 ppm
2015-06-025701-008-15460.649 ppm
2015-06-025701-011-15000.624 ppm
2015-06-025701-801-10490.727 ppm
2015-06-025701-804-09300.667 ppm
2015-06-105810-005-10150.280 ppm
2015-07-145701-008-08280.665 ppm
2015-07-145701-011-13500.795 ppm
2015-07-145701-800-11400.719 ppm
2015-07-145701-802-09220.654 ppm
2015-07-145701-803-13110.867 ppm
2015-08-045701-008-08510.760 ppm
2015-08-045701-011-14100.689 ppm
2015-08-045701-801-09420.715 ppm
2015-08-045701-804-09190.715 ppm
2015-09-155701-008-08430.730 ppm
2015-09-155701-011-14090.747 ppm
2015-09-155701-800-12040.762 ppm
2015-09-155701-802-09320.780 ppm
2015-09-155701-803-14270.652 ppm
2015-10-135701-008-08330.521 ppm
2015-10-135701-011-14330.519 ppm
2015-10-135701-801-10020.534 ppm
2015-10-135701-804-09190.540 ppm
2015-11-035701-008-08480.784 ppm
2015-11-035701-011-14190.738 ppm
2015-11-035701-800-12060.747 ppm
2015-11-035701-802-09420.790 ppm
2015-11-035701-803-14380.585 ppm
2015-12-085701-008-09230.600 ppm
2015-12-085701-011-14340.671 ppm
2015-12-085701-801-10270.674 ppm
2015-12-085701-804-09530.600 ppm
2016-01-055701-008-08550.563 ppm
2016-01-055701-011-14350.522 ppm
2016-01-055701-800-12570.563 ppm
2016-01-055701-802-10010.537 ppm
2016-01-055701-803-14520.511 ppm
2016-02-095701-008-08550.560 ppm
2016-02-095701-011-14070.554 ppm
2016-02-095701-801-09560.589 ppm
2016-02-095701-804-09270.554 ppm
2016-03-085701-008-08580.660 ppm
2016-03-085701-011-14350.641 ppm
2016-03-085701-800-13030.560 ppm
2016-03-085701-802-09560.644 ppm
2016-03-085701-803-14580.516 ppm
2016-04-055701-008-09170.610 ppm
2016-04-055701-011-14310.573 ppm
2016-04-055701-801-10130.545 ppm
2016-04-055701-804-09460.590 ppm
2016-05-035701-008-08440.688 ppm
2016-05-035701-011-13520.669 ppm
2016-05-035701-800-11460.708 ppm
2016-05-035701-802-09330.642 ppm
2016-05-035701-803-14180.722 ppm
2016-06-075701-008-09210.697 ppm
2016-06-075701-011-14120.740 ppm
2016-06-075701-801-10280.752 ppm
2016-06-075701-804-09570.722 ppm
2016-07-125701-008-09410.710 ppm
2016-07-125701-011-14070.693 ppm
2016-07-125701-800-13220.705 ppm
2016-07-125701-802-10280.731 ppm
2016-07-125701-803-14170.557 ppm
2016-08-095701-008-09400.707 ppm
2016-08-095701-011-14420.677 ppm
2016-08-095701-801-10410.640 ppm
2016-08-095701-804-10110.685 ppm
2016-09-135701-008-09090.698 ppm
2016-09-135701-011-11100.635 ppm
2016-09-135701-800-09050.650 ppm
2016-09-135701-802-10030.626 ppm
2016-09-135701-803-11390.593 ppm
2016-10-115701-008-08310.646 ppm
2016-10-115701-011-14260.646 ppm
2016-10-115701-801-09500.640 ppm
2016-10-115701-804-09070.634 ppm
2016-11-085701-008-08590.770 ppm
2016-11-085701-011-13420.745 ppm
2016-11-085701-800-12080.709 ppm
2016-11-085701-802-09450.755 ppm
2016-11-085701-803-14010.747 ppm
2016-12-065701-008-10280.844 ppm
2016-12-065701-011-14140.795 ppm
2016-12-065701-801-11070.858 ppm
2016-12-065701-804-10570.831 ppm
2017-01-105701-008-09000.717 ppm
2017-01-105701-011-12570.732 ppm
2017-01-105701-800-11510.714 ppm
2017-01-105701-802-09450.738 ppm
2017-01-125701-803-12100.636 ppm
2017-02-095701-008-10510.690 ppm
2017-02-095701-011-14520.668 ppm
2017-02-095701-801-13120.684 ppm
2017-02-095701-804-13010.654 ppm
2017-03-075701-800-13460.651 ppm
2017-03-075701-802-10250.736 ppm
2017-03-075701-803-15290.598 ppm
2017-03-105701-008-13190.716 ppm
2017-03-105701-011-12500.739 ppm
2017-04-045701-801-10370.687 ppm
2017-04-045701-804-09590.701 ppm
2017-04-115701-008-08540.695 ppm
2017-04-115701-011-15480.674 ppm
2017-05-095701-800-12170.658 ppm
2017-05-095701-802-09320.661 ppm
2017-05-095701-803-14350.605 ppm
2017-05-105701-008-09300.735 ppm
2017-05-115701-011-14470.640 ppm
2017-06-135701-008-09000.753 ppm
2017-06-135701-011-11250.649 ppm
2017-06-135701-801-10170.741 ppm
2017-06-135701-804-09420.677 ppm
2017-07-115701-008-08550.737 ppm
2017-07-115701-011-11170.641 ppm
2017-07-115701-800-10000.739 ppm
2017-07-115701-802-09250.739 ppm
2017-07-115701-803-10560.642 ppm
2017-08-155701-008-15100.713 ppm
2017-08-155701-011-14020.639 ppm
2017-08-155701-801-09270.754 ppm
2017-08-155701-804-08480.769 ppm
2017-09-055701-008-08400.742 ppm
2017-09-055701-011-14280.734 ppm
2017-09-055701-800-12570.737 ppm
2017-09-055701-802-09420.749 ppm
2017-09-055701-803-14460.612 ppm
2017-10-105701-008-08260.721 ppm
2017-10-105701-011-15050.749 ppm
2017-10-105701-801-09560.734 ppm
2017-10-105701-804-09130.734 ppm
2017-11-075701-008-08320.674 ppm
2017-11-075701-011-14110.772 ppm
2017-11-075701-800-12360.759 ppm
2017-11-075701-802-09240.757 ppm
2017-11-075701-803-14360.528 ppm
2017-12-125701-008-08470.697 ppm
2017-12-125701-011-14290.676 ppm
2017-12-125701-801-09560.670 ppm
2017-12-125701-804-09150.674 ppm