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EWG's Tap Water Database — 2019 UPDATE

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Selenium

Connecticut Water Company - Shoreline Region-chester System

Selenium is an essential element in diets. But too much selenium can decrease thyroid hormone production and cause hair loss, skin lesions and brittle fingernails.

 

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
2014ND40ND
2015ND20ND
2016ND30ND
2017ND20ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 30 ppb

The EWG Health Guideline of 30 ppb for selenium was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against hair loss and nail damage.

EPA Maximum Contaminant
Level (MCL) 50 ppb

The legal limit for selenium, established in 1991, was based on human epidemiological studies of populations exposed to naturally occurring selenium in drinking water. This limit does not include any additional consideration of children’s health.

ppb = parts per billion

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
2014-08-13BG93531IOC1ND
2014-12-04BH49355IOC1ND
2015-02-12BH73176IOC1ND
2015-02-12BH73175IOCRND
2016-01-27BK58353IOC1ND
2016-01-27BK58356IOCRND
2016-05-25BN40398IOC1ND
2017-01-18BX33132IOC1ND
2017-06-12BY37361IOCRND