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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

Suburban Water Systems-covina Knolls

NOTE: Suburban Water Systems-covina Knolls purchases water from Covina Irrigating Company which is required to test for fluoride. Sample information shown below was taken by Covina Irrigating Company.

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.

 

25

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.390 ppm110.390 ppm
20130.326 ppm770.300 ppm - 0.350 ppm
20140.352 ppm990.300 ppm - 0.400 ppm
20150.313 ppm330.300 ppm - 0.320 ppm
20160.200 ppm330.110 ppm - 0.280 ppm
20170.295 ppm220.280 ppm - 0.310 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

NOTE: Suburban Water Systems-covina Knolls purchases water from Covina Irrigating Company which is required to test for fluoride. Sample information shown below was taken by Covina Irrigating Company.

Date Lab ID Result
2012-04-239588-008-10000.390 ppm
2013-01-219588-002-11300.310 ppm
2013-01-219588-001-11200.320 ppm
2013-01-219588-003-11400.340 ppm
2013-07-089588-001-10000.340 ppm
2013-07-089588-002-10100.300 ppm
2013-07-089588-003-10200.320 ppm
2013-07-089588-012-08000.350 ppm
2014-01-279588-001-08450.400 ppm
2014-04-289588-012-08150.390 ppm
2014-07-079588-001-10250.360 ppm
2014-07-079588-002-10350.300 ppm
2014-07-079588-003-10450.320 ppm
2014-07-259588-002-11050.330 ppm
2014-10-069588-008-12020.330 ppm
2014-10-069588-012-09400.390 ppm
2014-10-249588-003-10150.350 ppm
2015-04-069588-008-11220.300 ppm
2015-07-079588-003-11050.320 ppm
2015-07-079588-002-10550.320 ppm
2016-01-049588-002-10150.280 ppm
2016-04-119588-012-08550.210 ppm
2016-10-039588-012-09300.110 ppm
2017-04-039588-012-08400.310 ppm
2017-10-029588-012-09250.280 ppm