Know Your Environment. Protect Your Health.

Selenium

Bradley Waterworks

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND50ND
2019ND50ND
2020ND40ND
2021ND50ND
2022ND30ND
2023ND20ND

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
2018-03-20Y180810018ND
2018-05-29Y181510006ND
2018-05-29Y181510007ND
2018-08-13Y182280033ND
2018-10-16Y182910036ND
2019-02-25Y190590038ND
2019-05-13Y191360053ND
2019-08-12Y192270055ND
2019-11-05Y193110048ND
2019-11-05Y193110002ND
2020-03-02Y200650041ND
2020-06-02Y201560022ND
2020-08-18Y202330050ND
2020-11-07Y203240056ND
2021-02-23Y210560027ND
2021-04-19Y211110024ND
2021-04-19Y211110023ND
2021-07-26Y212100033ND
2021-11-16Y213230004ND
2022-02-14Y220480064ND
2022-08-15Y222300037ND
2022-10-11Y222850016ND
2023-02-22Y230550006ND
2023-09-11Y232570033ND