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EWG's Tap Water Database — 2019 UPDATE

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Selenium

Los Angeles Department of Water and Power

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.

 

53

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND90ND
2013ND80ND
20141.36 ppb82ND - 5.80 ppb
2015ND90ND
20160.520 ppb101ND - 5.20 ppb
2017ND90ND

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
2012-01-181200-205-1200ND
2012-02-021200-133-1000ND
2012-02-141200-011-1020ND
2012-05-171200-011-0900ND
2012-05-221200-133-1045ND
2012-08-141200-011-1200ND
2012-08-141200-133-1030ND
2012-11-131200-133-0840ND
2012-11-131200-011-1035ND
2013-02-201200-133-1200ND
2013-03-201200-011-1050ND
2013-05-091200-011-1025ND
2013-05-091200-133-0825ND
2013-08-131200-011-1235ND
2013-08-131200-133-1040ND
2013-11-191200-011-1045ND
2013-11-191200-133-0800ND
2014-02-261200-011-1215ND
2014-02-261200-133-1215ND
2014-05-141200-011-1115ND
2014-05-141200-133-1105ND
2014-08-121200-011-1030ND
2014-08-201200-133-09005.10 ppb
2014-11-121200-011-1240ND
2014-11-181200-133-09355.80 ppb
2015-02-111200-133-0825ND
2015-02-191200-011-0845ND
2015-05-191200-011-0900ND
2015-05-191200-133-1100ND
2015-08-041200-133-0645ND
2015-08-041200-011-1040ND
2015-10-201200-205-1155ND
2015-11-051200-011-1005ND
2015-11-051200-133-0755ND
2016-02-091200-133-0930ND
2016-02-241200-011-1215ND
2016-05-251200-011-1135ND
2016-05-251200-133-1210ND
2016-05-311200-133-1045ND
2016-07-211200-205-1225ND
2016-08-171200-011-1010ND
2016-08-231200-133-1005ND
2016-11-211200-133-11155.20 ppb
2016-11-291200-011-0845ND
2017-02-211200-133-1210ND
2017-02-211200-011-1140ND
2017-05-091200-011-0940ND
2017-05-171200-133-0941ND
2017-07-121200-205-1000ND
2017-08-011200-133-0940ND
2017-08-211200-011-1010ND
2017-11-201200-011-1000ND
2017-11-201200-133-1040ND