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EWG's Tap Water Database — 2019 UPDATE

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Selenium

Wellborn SUD

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
20121.07 ppb31ND - 3.20 ppb
20130.433 ppb31ND - 1.30 ppb
2014ND20ND
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
2012-02-01AB79927ND
2012-06-18AB930613.20 ppb
2012-09-12AC00734ND
2013-02-0613022280041.30 ppb
2013-12-12Q1317624020ND
2013-12-12Q1317624014ND
2014-02-13AC42866ND
2014-02-13AC42867ND
2015-03-24AC85810ND
2015-03-24AC85814ND
2016-03-09AD27813ND
2016-03-09AD27814ND
2016-03-09AD27811ND
2017-03-07AD73643ND
2017-03-07AD73639ND