Know Your Environment. Protect Your Health.

Selenium

Town of Hampstead

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.

 

33

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.09 ppb119ND - 5.00 ppb
2019N/A00N/A
20200.250 ppb82ND - 1.000 ppb
20211.13 ppb85ND - 2.00 ppb
2022ND20ND
2023ND40ND

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
2018-06-04E054175_121.000 ppb
2018-09-05E055512_043.00 ppb
2018-09-05E055512_201.000 ppb
2018-09-05E055512_181.000 ppb
2018-09-05E055512_152.00 ppb
2018-09-05E055512_104.00 ppb
2018-09-05E055512_083.00 ppb
2018-09-05E055512_063.00 ppb
2018-10-02E19001148003ND
2018-10-02E1900148002ND
2018-12-03E056641_025.00 ppb
2020-03-03E062383-06ND
2020-03-03E062383-18ND
2020-03-03E20002994004ND
2020-06-03E20003718002ND
2020-07-29E21000292002ND
2020-09-01E064325-041.000 ppb
2020-09-01E064325-111.000 ppb
2020-12-14E065517_02ND
2021-01-21E21001852002ND
2021-06-02E067105_142.00 ppb
2021-09-01E068099_05ND
2021-09-01E068099_062.00 ppb
2021-09-01E068099_121.000 ppb
2021-09-01E068099_15ND
2021-09-01E068099_162.00 ppb
2021-12-02E069059_022.00 ppb
2022-03-01E2200123702ND
2022-08-03E230002502ND
2023-03-01030123-316BB1-3ND
2023-09-05090523-316T-T1ND
2023-09-05090523-316Z-Z1ND
2023-12-04120423-316AA1-BB3ND