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EWG's Tap Water Database — 2019 UPDATE

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Selenium

Washington Aqueduct Division

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.

 

143

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.458 ppb2417ND - 0.900 ppb
20130.617 ppb2419ND - 1.10 ppb
20140.104 ppb244ND - 0.700 ppb
2015ND240ND
2016ND240ND
2017ND230ND

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
2012-01-01DalecarliaND
2012-01-01McMillanND
2012-02-01DalecarliaND
2012-02-01McMillanND
2012-03-01Dalecarlia0.500 ppb
2012-03-01McMillan0.500 ppb
2012-04-01Dalecarlia0.500 ppb
2012-04-01McMillan0.600 ppb
2012-05-01Dalecarlia0.700 ppb
2012-05-01McMillan0.600 ppb
2012-06-01Dalecarlia0.500 ppb
2012-06-01McMillan0.600 ppb
2012-07-01Dalecarlia0.700 ppb
2012-07-01McMillan0.700 ppb
2012-08-01Dalecarlia0.900 ppb
2012-08-01McMillan0.900 ppb
2012-09-01Dalecarlia0.700 ppb
2012-09-01McMillan0.700 ppb
2012-10-01Dalecarlia0.600 ppb
2012-10-01McMillan0.700 ppb
2012-11-01Dalecarlia0.600 ppb
2012-11-01McMillanND
2012-12-01DalecarliaND
2012-12-01McMillanND
2013-01-01DalecarliaND
2013-01-01McMillanND
2013-02-01Dalecarlia0.500 ppb
2013-02-01McMillan0.600 ppb
2013-03-01DalecarliaND
2013-03-01McMillan0.500 ppb
2013-04-01Dalecarlia0.600 ppb
2013-04-01McMillan0.600 ppb
2013-05-01Dalecarlia0.600 ppb
2013-05-01McMillan0.700 ppb
2013-06-01Dalecarlia0.700 ppb
2013-06-01McMillan0.700 ppb
2013-07-01Dalecarlia0.900 ppb
2013-07-01McMillan1.000 ppb
2013-08-01Dalecarlia0.900 ppb
2013-08-01McMillan1.000 ppb
2013-09-01Dalecarlia1.000 ppb
2013-09-01McMillan1.000 ppb
2013-10-01Dalecarlia1.000 ppb
2013-10-01McMillan1.10 ppb
2013-11-01Dalecarlia0.700 ppb
2013-11-01McMillan0.700 ppb
2013-12-01DalecarliaND
2013-12-01McMillanND
2014-01-01DalecarliaND
2014-01-01McMillanND
2014-02-01Dalecarlia0.600 ppb
2014-02-01McMillan0.700 ppb
2014-03-01Dalecarlia0.600 ppb
2014-03-01McMillan0.600 ppb
2014-04-01DalecarliaND
2014-04-01McMillanND
2014-05-01DalecarliaND
2014-05-01McMillanND
2014-06-01DalecarliaND
2014-06-01McMillanND
2014-07-01DalecarliaND
2014-07-01McMillanND
2014-08-01DalecarliaND
2014-08-01McMillanND
2014-09-01DalecarliaND
2014-09-01McMillanND
2014-10-01DalecarliaND
2014-10-01McMillanND
2014-11-01DalecarliaND
2014-11-01McMillanND
2014-12-01DalecarliaND
2014-12-01McMillanND
2015-01-01DalecarliaND
2015-01-01McMillanND
2015-02-01DalecarliaND
2015-02-01McMillanND
2015-03-01DalecarliaND
2015-03-01McMillanND
2015-04-01DalecarliaND
2015-04-01McMillanND
2015-05-01DalecarliaND
2015-05-01McMillanND
2015-06-01DalecarliaND
2015-06-01McMillanND
2015-07-01DalecarliaND
2015-07-01McMillanND
2015-08-01DalecarliaND
2015-08-01McMillanND
2015-09-01DalecarliaND
2015-09-01McMillanND
2015-10-01DalecarliaND
2015-10-01McMillanND
2015-11-01DalecarliaND
2015-11-01McMillanND
2015-12-01DalecarliaND
2015-12-01McMillanND
2016-01-01DalecarliaND
2016-01-01McMillanND
2016-02-01DalecarliaND
2016-02-01McMillanND
2016-03-01DalecarliaND
2016-03-01McMillanND
2016-04-01DalecarliaND
2016-04-01McMillanND
2016-05-01DalecarliaND
2016-05-01McMillanND
2016-06-01DalecarliaND
2016-06-01McMillanND
2016-07-01DalecarliaND
2016-07-01McMillanND
2016-08-01DalecarliaND
2016-08-01McMillanND
2016-09-01DalecarliaND
2016-09-01McMillanND
2016-10-01DalecarliaND
2016-10-01McMillanND
2016-11-01DalecarliaND
2016-11-01McMillanND
2016-12-01DalecarliaND
2016-12-01McMillanND
2017-01-01DalecarliaND
2017-01-01McMillanND
2017-02-01DalecarliaND
2017-02-01McMillanND
2017-03-01DalecarliaND
2017-03-01McMillanND
2017-04-01DalecarliaND
2017-04-01McMillanND
2017-05-01DalecarliaND
2017-05-01McMillanND
2017-06-01DalecarliaND
2017-06-01McMillanND
2017-07-01DalecarliaND
2017-07-01McMillanND
2017-08-01DalecarliaND
2017-08-01McMillanND
2017-09-01DalecarliaND
2017-09-01McMillanND
2017-10-01DalecarliaND
2017-10-01McMillanND
2017-11-01DalecarliaND
2017-11-01McMillanND
2017-12-01DalecarliaND