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EWG's Tap Water Database — 2019 UPDATE

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Fluoride

Connecticut Water Company - Shoreline Region-chester System

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
20140.168 ppm41ND - 0.670 ppm
2015ND20ND
2016ND30ND
2017ND20ND

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
2012-01-04070IOC1ND
2012-01-04071IOC1ND
2013-01-08245IOC1ND
2013-01-08247IOC1ND
2014-01-29140130CWCCIOC1ND
2014-01-29140130CWCFIOC1ND
2014-08-13BG93531IOC10.670 ppm
2014-12-04BH49355IOC1ND
2015-02-12BH73176IOC1ND
2015-02-12BH73175IOCRND
2016-01-27BK58353IOC1ND
2016-01-27BK58356IOCRND
2016-05-25BN40398IOC1ND
2017-01-18BX33132IOC1ND
2017-06-12BY37361IOCRND