Know Your Environment. Protect Your Health.

Selenium

Lockesburg Waterworks

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND60ND
2019ND30ND
2020ND30ND
2021ND40ND
20222.64 ppb51ND - 13.2 ppb
2023ND30ND

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
2018-01-31Y180330008ND
2018-03-21Y180810021ND
2018-05-21Y181440037ND
2018-07-24Y182080024ND
2018-10-22Y182980021ND
2018-12-17Y183540003ND
2019-02-04Y190380080ND
2019-05-28Y191500002ND
2019-05-28Y191500001ND
2020-05-20Y201420040ND
2020-09-08Y202540052ND
2020-11-03Y203100058ND
2021-01-27Y210280015ND
2021-05-24Y211470039ND
2021-07-20Y212030013ND
2021-10-26Y213010024ND
2022-01-11Y220130041ND
2022-04-06Y22097000313.2 ppb
2022-04-06Y220970004ND
2022-08-15Y222300059ND
2022-10-19Y222930039ND
2023-02-07Y230400074ND
2023-02-07Y230400073ND
2023-05-03Y231240066ND