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EWG's Tap Water Database

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Selenium

East Cherry Creek Valley Water and Sanitation District

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.

 

40

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20101.11 ppb126ND - 5.40 ppb
2011N/A00N/A
20120.286 ppb142ND - 2.00 ppb
2013N/A00N/A
20140.231 ppb133ND - 1.000 ppb
2015ND10ND

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 Result
2010-07-210.990 ppb
2010-07-21ND
2010-07-211.20 ppb
2010-07-221.70 ppb
2010-07-221.60 ppb
2010-07-22ND
2010-07-225.40 ppb
2010-07-22ND
2010-07-27ND
2010-07-27ND
2010-07-27ND
2010-07-272.40 ppb
2012-04-12ND
2012-04-12ND
2012-04-13ND
2012-04-19ND
2012-04-23ND
2012-04-26ND
2012-04-26ND
2012-05-04ND
2012-05-10ND
2012-05-17ND
2012-05-17ND
2012-05-252.00 ppb
2012-07-132.00 ppb
2012-10-25ND
2014-05-191.000 ppb
2014-08-081.000 ppb
2014-08-13ND
2014-08-14ND
2014-08-14ND
2014-08-19ND
2014-08-19ND
2014-08-21ND
2014-08-25ND
2014-08-25ND
2014-08-25ND
2014-08-25ND
2014-11-191.000 ppb
2015-02-03ND