Know Your Environment. Protect Your Health.

Selenium

Cws-split Mountain Water System

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.

 

68

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND60ND
2019ND50ND
2020ND130ND
2021ND30ND
2022ND180ND
2023ND230ND

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
2018-01-23CA1500407_006_006-201801230950ND
2018-01-23CA1500407_005_005-201801231010ND
2018-02-07CA1500407_006_006-201802071430ND
2018-02-07CA1500407_005_005-201802071345ND
2018-05-02CA1500407_006_006-201805020935ND
2018-05-02CA1500407_005_005-201805020835ND
2019-01-15CA1500407_006_006-201901151132ND
2019-01-15CA1500407_005_005-201901151150ND
2019-05-08CA1500407_005_005-201905081111ND
2019-05-08CA1500407_006_006-201905081138ND
2019-05-13CA1500407_002_002-201905130958ND
2020-01-22CA1500407_006_006-202001221438ND
2020-01-22CA1500407_005_005-202001221450ND
2020-02-11CA1500407_007_007-202002111247ND
2020-05-06CA1500407_006_006-202005061329ND
2020-05-06CA1500407_005_005-202005061335ND
2020-06-09CA1500407_005_005-202006090820ND
2020-06-09CA1500407_006_006-202006090834ND
2020-08-05CA1500407_005_005-202008051050ND
2020-08-05CA1500407_006_006-202008051023ND
2020-10-21CA1500407_005_005-202010211339ND
2020-10-21CA1500407_006_006-202010211345ND
2020-11-19CA1500407_005_005-202011191234ND
2020-11-19CA1500407_006_006-202011191213ND
2021-01-26CA1500407_006_006-202101261336ND
2021-01-26CA1500407_005_005-202101261344ND
2021-01-26CA1500407_006_006-202101261336ND
2022-01-18CA1500407_005_005-202201181056ND
2022-01-18CA1500407_006_006-202201181111ND
2022-04-07CA1500407_005_005-202204071013ND
2022-04-07CA1500407_006_006-202204071005ND
2022-05-03CA1500407_005_005-202205031106ND
2022-05-03CA1500407_006_006-202205031110ND
2022-06-15CA1500407_005_005-202206151412ND
2022-06-15CA1500407_006_006-202206151416ND
2022-07-13CA1500407_005_005-202207130916ND
2022-07-13CA1500407_006_006-202207130925ND
2022-08-11CA1500407_005_005-202208110938ND
2022-08-11CA1500407_006_006-202208110933ND
2022-10-06CA1500407_006_006-202210060825ND
2022-10-06CA1500407_005_005-202210060815ND
2022-11-15CA1500407_006_006-202211151132ND
2022-11-15CA1500407_005_005-202211151123ND
2022-12-15CA1500407_006_006-202212151103ND
2022-12-15CA1500407_005_005-202212151057ND
2023-01-12CA1500407_005_005-202301121113ND
2023-01-12CA1500407_006_006-202301121110ND
2023-01-26CA1500407_005_005-202301260926ND
2023-01-26CA1500407_006_006-202301260934ND
2023-02-07CA1500407_005_005-202302071417ND
2023-02-07CA1500407_006_006-202302071432ND
2023-02-23CA1500407_007_007-202302231300ND
2023-03-13CA1500407_006_006-202303130955ND
2023-03-13CA1500407_005_005-202303131005ND
2023-04-12CA1500407_006_006-202304121344ND
2023-04-12CA1500407_005_005-202304121340ND
2023-05-18CA1500407_005_005-202305180908ND
2023-05-18CA1500407_006_006-202305180914ND
2023-06-08CA1500407_005_005-202306081113ND
2023-06-08CA1500407_006_006-202306081135ND
2023-07-12CA1500407_006_006-202307120920ND
2023-07-12CA1500407_005_005-202307120930ND
2023-08-15CA1500407_006_006-202308151420ND
2023-08-15CA1500407_005_005-202308151425ND
2023-10-10CA1500407_006_006-202310101143ND
2023-10-10CA1500407_005_005-202310101147ND
2023-11-15CA1500407_005_005-202311150924ND
2023-11-15CA1500407_006_006-202311150915ND