Know Your Environment. Protect Your Health.

Selenium

Metropolitan District Commission

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.

 

42

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND70ND
2019ND70ND
2020ND70ND
2021ND70ND
2022ND70ND
2023ND70ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-07-18AE01630GEND
2018-07-18AE01632GEND
2018-07-18AE01640GEND
2018-07-18AE01641GEND
2018-07-18AE01637GEND
2018-07-18AE01636GEND
2018-07-18AE01631GEND
2019-12-03CE70734ND
2019-12-03CE70735ND
2019-12-03CE70736ND
2019-12-03CE70733ND
2019-12-03CE70741ND
2019-12-03CE70739ND
2019-12-03CE70740ND
2020-12-08IOC1 200600637ND
2020-12-08IOC1 200600611ND
2020-12-08IOCR 200600614ND
2020-12-08IOCR 200600615ND
2020-12-08IOCR 200600616ND
2020-12-08IOCR 200600617ND
2020-12-09IOC1 200600603ND
2021-11-23E300107450 300107454ND
2021-11-23I300107476 300107479ND
2021-11-23E300107451 300107460ND
2021-11-29E300109635 300109640ND
2021-11-29I300109610 300109613ND
2021-11-30I300109649 300109653ND
2021-11-30I300109650 300109659ND
2022-12-08I300283837 300283842ND
2022-12-08300283822 300283827BND
2022-12-15E300287100 300287104ND
2022-12-15I300287081 300287086ND
2022-12-15I300287109 300287112ND
2022-12-15E300287072 300287076ND
2022-12-15E300287053 300287057ND
2023-12-05E300456248 300456251ND
2023-12-05I300456268 300456271ND
2023-12-05I300456261 300456264ND
2023-12-05I300456281 300456284ND
2023-12-06E300456222 300456225ND
2023-12-06E300456228 300456231ND
2023-12-06I300456234 300456237ND