Menu

EWG's Tap Water Database — 2021 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.

 

50

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND30ND
2015ND30ND
2016ND170ND
2017ND60ND
2018N/A00N/A
2019ND210ND

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
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
2016-01-195442-040-0945ND
2016-01-195442-035-0950ND
2016-01-255442-048-0940ND
2016-01-255442-062-0930ND
2016-01-255442-028-0840ND
2016-02-095442-068-1025ND
2016-02-095442-070-1110ND
2016-02-095442-069-1010ND
2016-02-095442-016-1028ND
2016-02-105442-071-1125ND
2016-03-095442-023-1041ND
2016-03-285442-011-1138ND
2016-03-285442-067-0856ND
2016-04-205442-041-0934ND
2016-04-205442-026-1016ND
2016-06-085442-036-0945ND
2016-06-275442-095-1050ND
2017-11-219590-045-0935ND
2017-11-219590-055-0940ND
2017-11-219590-063-1010ND
2017-12-279590-063-1010ND
2017-12-279590-093-1115ND
2017-12-279590-094-0910ND
2019-02-069590-067-1100ND
2019-02-119590-070-1125ND
2019-02-119590-071-1120ND
2019-02-199590-011-1145ND
2019-02-269590-062-1210ND
2019-02-269590-028-1150ND
2019-02-269590-048-1225ND
2019-03-139590-095-0940ND
2019-03-139590-095-0925ND
2019-03-139590-094-0920ND
2019-03-139590-036-1035ND
2019-03-199590-054-1300ND
2019-03-199590-035-1120ND
2019-03-199590-040-1145ND
2019-03-199590-041-0930ND
2019-03-199590-053-1315ND
2019-03-269590-069-0945ND
2019-06-199590-037-1000ND
2019-08-129590-026-0900ND
2019-08-199590-023-1020ND
2019-12-239590-095-0933ND