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EWG's Tap Water Database

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Selenium

City of Flint

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.

 

10

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20103.00 ppb113.00 ppb
2011ND10ND
2012ND20ND
2013ND20ND
20140.333 ppb31ND - 1.000 ppb
2015N/A00N/A

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 30 ppb

The 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.

ppb = parts per billion.

EPA Maximum Contaminant
Level (MCL) 50 ppb

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppb = parts per billion.

EPA Maximum Contaminant
Level Goal (MCLG)50.0 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Lab ID Result
2010-11-05LLD595413.00 ppb
2011-12-02LLE11088ND
2012-05-03LLE26411ND
2012-07-29LLE35013ND
2013-01-18LLE61821ND
2013-07-18LLE83917ND
2014-05-22LLF19430ND
2014-08-06LLF312221.000 ppb
2014-10-28LLF44687ND
2015-06-011.000 ppb*

* Sample result is taken from the system's 2015 CCR report.