Know Your Environment. Protect Your Health.

Selenium

Manchester Water Department

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND80ND
2019ND20ND
2020ND80ND
2021ND20ND
2022ND20ND
2023ND80ND

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
2018-02-05AA82672-IOC1ND
2018-02-05AA82673-IOC1ND
2018-02-05AA82666-IOC1ND
2018-02-06AA82689-IOC1ND
2018-02-06AA82690-IOC1ND
2018-02-07AA82711-IOC1ND
2018-02-07AA82712-IOC1ND
2018-02-23AA82899-IOCRND
2019-05-03AA88242-IOC1ND
2019-05-16AA88408-IOCRND
2020-10-01AA94988-IOCRND
2020-12-07AA95917-IOC1ND
2020-12-07AA95918-IOC1ND
2020-12-08AA95934-IOC1ND
2020-12-08AA95935-IOC1ND
2020-12-09AA95952-IOC1ND
2020-12-09AA95953-IOC1ND
2020-12-10AA95963-IOC1ND
2021-11-04211104-1-06IOCND
2021-11-04211104-1-04RAW IOCND
2022-05-13220513-1-04 RAW IOCND
2022-06-03220603-1-06IOCND
2023-12-04231204-3-01IOCND
2023-12-04231204-3-02 IOCND
2023-12-05231205-1-06 IOCND
2023-12-05231205-3-03 IOCND
2023-12-05231205-3-04 IOCND
2023-12-05231205-1-04 RAW IOCND
2023-12-06231206-3-05 IOCND
2023-12-06231206-3-06 IOCND