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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

Cal-am Water Company - Duarte

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.

 

57

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
20130.310 ppm22220.190 ppm - 0.410 ppm
20140.326 ppm880.200 ppm - 0.390 ppm
20150.301 ppm770.200 ppm - 0.370 ppm
20160.283 ppm20200.120 ppm - 0.390 ppm
2017N/A00N/A

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
2013-09-129590-007-13300.260 ppm
2013-09-129590-003-13400.200 ppm
2013-09-129590-008-14250.390 ppm
2013-09-129590-010-14500.320 ppm
2013-09-129590-002-14400.380 ppm
2013-09-129590-004-14150.300 ppm
2013-09-129590-009-13550.320 ppm
2013-09-181225-009-10250.300 ppm
2013-09-181225-007-09500.260 ppm
2013-09-181225-008-11050.370 ppm
2013-09-181225-004-10450.280 ppm
2013-09-181225-010-11500.300 ppm
2013-09-181225-003-10100.190 ppm
2013-09-181225-002-11300.370 ppm
2013-09-181225-019-08500.310 ppm
2013-12-049588-008-11400.400 ppm
2013-12-049588-004-11300.300 ppm
2013-12-049588-003-10550.230 ppm
2013-12-049588-007-10400.270 ppm
2013-12-049588-009-11050.320 ppm
2013-12-049588-010-12200.340 ppm
2013-12-049588-002-12100.410 ppm
2014-06-231225-007-12400.310 ppm
2014-06-231225-002-13000.390 ppm
2014-06-231225-003-11100.310 ppm
2014-06-231225-008-12350.390 ppm
2014-06-231225-009-11350.330 ppm
2014-06-231225-010-13300.320 ppm
2014-06-231225-019-10050.360 ppm
2014-12-039588-019-10200.200 ppm
2015-09-281225-003-10500.200 ppm
2015-09-281225-007-12000.260 ppm
2015-09-281225-008-13300.370 ppm
2015-09-281225-010-09450.310 ppm
2015-09-281225-009-13450.280 ppm
2015-10-141225-002-12050.370 ppm
2015-10-141225-019-09450.320 ppm
2016-06-201225-008-11450.370 ppm
2016-06-201225-019-11150.340 ppm
2016-06-201225-010-11350.310 ppm
2016-07-201225-007-09300.260 ppm
2016-07-201225-002-11100.390 ppm
2016-07-201225-003-10000.270 ppm
2016-07-201225-009-10300.290 ppm
2016-08-109590-019-11250.360 ppm
2016-08-109590-008-10300.370 ppm
2016-08-109590-007-10450.240 ppm
2016-08-109590-010-10150.300 ppm
2016-08-119590-009-11500.280 ppm
2016-08-119590-003-12050.200 ppm
2016-08-119590-002-11050.360 ppm
2016-09-079588-007-12450.180 ppm
2016-09-079588-003-13050.120 ppm
2016-09-079588-008-13450.280 ppm
2016-09-079588-010-13150.230 ppm
2016-09-079588-002-13300.290 ppm
2016-09-079588-009-14000.210 ppm