Know Your Environment. Protect Your Health.

Selenium

Walnut Grove Utilities

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.

 

26

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND60ND
2020N/A00N/A
2021ND20ND
2022ND80ND
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
2018-08-15292292-2018-DWIND
2018-10-16295670-2018-DWND
2019-02-26301436-2019-DWND
2019-02-26301437-2019-DWIND
2019-03-05301698-2019-DWND
2019-03-05301699-2019-DWIND
2019-03-12302100-2019-DWND
2019-03-12302099-2019-DWND
2021-07-217380944003ND
2021-09-077387721001ND
2022-03-08810-17505-1BND
2022-03-08810-17576-1BND
2022-03-08810-17508-1BND
2022-03-09FWC0111AND
2022-03-09810-18451-1BND
2022-03-09810-18448-1AND
2022-03-23810-18980-1IND
2022-05-23FWE0087-01ND
2023-02-15FXB0429ND
2023-04-04FXC0507-01ND
2023-04-04FXC0516-01ND
2023-04-05FXC0500-01ND
2023-04-05FXC0542-01ND
2023-04-05FXC0553-01ND
2023-04-05FXC0559-01ND
2023-07-31FXF0576-01ND