Know Your Environment. Protect Your Health.

Selenium

Town of Woodsboro

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
2018ND40ND
2019N/A00N/A
2020ND10ND
2021ND40ND
2022ND30ND
2023N/A00N/A

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
2018-03-14E18003348003ND
2018-12-05207_127_1_AND
2018-12-05207_148_2ND
2018-12-05207_148_3ND
2020-09-28E21000870005ND
2021-01-20207_192_1_2_3ND
2021-01-20207_193_1ND
2021-01-20207_194_1_AND
2021-06-30E22000007002ND
2022-04-06E2201012502ND
2022-04-06E2201012503ND
2022-04-06E2201012701ND