Know Your Environment. Protect Your Health.

Selenium

Annapolis PWS

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.

 

48

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.07 ppb81ND - 8.55 ppb
20191.61 ppb82ND - 7.20 ppb
2020ND80ND
20211.67 ppb82ND - 7.73 ppb
2022ND80ND
20231.52 ppb82ND - 7.02 ppb

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
2018-01-29AD11500ND
2018-01-29AD114998.55 ppb
2018-05-02AD18215ND
2018-05-02AD18214ND
2018-07-10AD29393ND
2018-07-10AD29394ND
2018-10-17AD34548ND
2018-10-17AD34549ND
2019-01-10AD37860ND
2019-01-10AD37861ND
2019-04-15AD46284ND
2019-04-15AD46285ND
2019-07-23AD52085ND
2019-07-23AD52084ND
2019-10-22AD568625.69 ppb
2019-10-22AD568637.20 ppb
2020-02-03AD60672ND
2020-02-03AD60671ND
2020-06-032010512ND
2020-06-032010513ND
2020-07-272011669ND
2020-07-272011670ND
2020-10-292016617ND
2020-10-292016616ND
2021-01-212020216ND
2021-01-212020217ND
2021-04-192103830ND
2021-04-192103829ND
2021-07-192113683ND
2021-07-192113682ND
2021-10-2621181445.65 ppb
2021-10-2621181457.73 ppb
2022-01-242122169ND
2022-01-242122168ND
2022-04-132204381ND
2022-04-132204382ND
2022-07-122214771ND
2022-07-122214772ND
2022-10-242219681ND
2022-10-242219680ND
2023-02-142301319ND
2023-02-142301320ND
2023-04-192303489ND
2023-04-1923034887.02 ppb
2023-07-1923116795.10 ppb
2023-07-192311680ND
2023-10-162316860ND
2023-10-162316861ND