Know Your Environment. Protect Your Health.

Selenium

Western Cass Water Supply Corporation

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND30ND
2020ND10ND
2021ND20ND
2022ND30ND
2023ND10ND

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
2018-03-08Q1809687016ND
2018-03-08Q1809687017ND
2019-05-02Q1918236012ND
2019-05-02Q1918236013ND
2019-05-02Q1918236014ND
2020-03-19Q2011997016ND
2021-10-25Q2129911020ND
2021-10-25Q2129911027ND
2022-04-14Q2211593001ND
2022-04-14Q2211593002ND
2022-11-16Q2234548004ND
2023-08-01Q2331111011ND