Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Selenium

Los Angeles County WW District 4 & 34-Lancaster

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
2012ND40ND
20130.351 ppb201ND - 7.02 ppb
2014ND30ND
2015ND30ND
2016ND170ND
2017ND60ND

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
2012-01-245442-053-0903ND
2012-01-245442-054-0937ND
2012-04-125442-054-1015ND
2012-11-145442-037-1157ND
2013-03-115442-062-1130ND
2013-03-115442-011-09317.02 ppb
2013-03-115442-016-1140ND
2013-03-115442-023-1045ND
2013-03-115442-028-1205ND
2013-03-125442-036-1106ND
2013-03-135442-035-1159ND
2013-03-135442-035-0852ND
2013-03-195442-026-0925ND
2013-03-195442-002-1135ND
2013-04-035442-063-0835ND
2013-04-095442-070-0945ND
2013-05-215442-040-0908ND
2013-06-045442-041-0910ND
2013-06-045442-048-0934ND
2013-06-125442-095-0859ND
2013-07-165442-045-1050ND
2013-07-175442-067-1050ND
2013-07-235442-071-1047ND
2013-07-245442-069-1002ND
2014-03-265442-055-1034ND
2014-05-215442-094-0825ND
2014-06-265442-093-0850ND
2015-01-285442-053-0915ND
2015-04-135442-054-0940ND
2015-08-185442-037-0930ND
2016-01-195442-035-0950ND
2016-01-195442-040-0945ND
2016-01-255442-062-0930ND
2016-01-255442-048-0940ND
2016-01-255442-028-0840ND
2016-02-095442-016-1028ND
2016-02-095442-068-1025ND
2016-02-095442-070-1110ND
2016-02-095442-069-1010ND
2016-02-105442-071-1125ND
2016-03-095442-023-1041ND
2016-03-285442-067-0856ND
2016-03-285442-011-1138ND
2016-04-205442-041-0934ND
2016-04-205442-026-1016ND
2016-06-085442-036-0945ND
2016-06-275442-095-1050ND
2017-11-219590-063-1010ND
2017-11-219590-055-0940ND
2017-11-219590-045-0935ND
2017-12-279590-063-1010ND
2017-12-279590-094-0910ND
2017-12-279590-093-1115ND