Know Your Environment. Protect Your Health.

Selenium

Heritage Ranch Community Services District

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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND40ND
2020ND30ND
2021ND30ND
2022ND40ND
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
2018-05-10CA4010012_002_002-201805101306ND
2018-05-10CA4010012_001_001-201805101300ND
2018-11-01CA4010012_002_002-201811011318ND
2018-11-01CA4010012_001_001-201811011307ND
2019-05-09CA4010012_002_002-201905091240ND
2019-05-09CA4010012_001_001-201905091217ND
2019-11-04CA4010012_001_001-201911041310ND
2019-11-04CA4010012_002_002-201911041315ND
2020-05-07CA4010012_001_001-202005071035ND
2020-05-07CA4010012_002_002-202005071053ND
2020-11-19CA4010012_001_001-202011191330ND
2021-06-10CA4010012_001_001-202106101322ND
2021-11-18CA4010012_002_002-202111181030ND
2021-11-18CA4010012_001_001-202111181020ND
2022-05-12CA4010012_002_002-202205120953ND
2022-05-12CA4010012_001_001-202205120944ND
2022-11-03CA4010012_002_002-202211031059ND
2022-11-03CA4010012_001_001-202211031053ND
2023-05-18CA4010012_002_002-202305180948ND
2023-05-18CA4010012_001_001-202305180931ND
2023-11-09CA4010012_001_001-202311091019ND
2023-11-09CA4010012_002_002-202311091028ND