Know Your Environment. Protect Your Health.

Selenium

California Water Service Company Las Lomas

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.

 

59

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND80ND
2019ND30ND
2020ND130ND
20211.05 ppb21ND - 2.10 ppb
20221.31 ppb1512ND - 4.10 ppb
20231.06 ppb1813ND - 2.50 ppb

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
2018-01-04CA2710013_009_009-201801041052ND
2018-02-06CA2710013_009_009-201802061346ND
2018-02-06CA2710013_004_004-201802061348ND
2018-02-06CA2710013_003_003-201802061402ND
2018-03-15CA2710013_009_009-201803151008ND
2018-05-01CA2710013_003_003-201805011410ND
2018-08-02CA2710013_003_003-201808021003ND
2018-12-18CA2710013_009_009-201812181204ND
2019-03-05CA2710013_009_009-201903051031ND
2019-05-07CA2710013_003_003-201905071117ND
2019-08-07CA2710013_003_003-201908071410ND
2020-02-04CA2710013_009_009-202002041250ND
2020-02-04CA2710013_004_004-202002041246ND
2020-02-04CA2710013_003_003-202002041326ND
2020-05-06CA2710013_009_009-202005061103ND
2020-05-06CA2710013_003_003-202005061034ND
2020-05-06CA2710013_004_004-202005061100ND
2020-08-12CA2710013_004_004-202008121414ND
2020-08-13CA2710013_004_004-202008131031ND
2020-08-13CA2710013_003_003-202008131024ND
2020-10-07CA2710013_009_009-202010071018ND
2020-11-05CA2710013_009_009-202011051154ND
2020-11-05CA2710013_003_003-202011051331ND
2020-11-05CA2710013_004_004-202011051152ND
2021-05-11CA2710013_003_003-202105111330ND
2021-09-21CA2710013_001_001-2021092112552.10 ppb
2022-04-18CA2710013_009_009-2022041810011.40 ppb
2022-05-03CA2710013_004_004-202205031056ND
2022-05-03CA2710013_003_003-202205031114ND
2022-05-03CA2710013_009_009-2022050310581.000 ppb
2022-06-01CA2710013_009_009-2022060110142.90 ppb
2022-07-12CA2710013_009_009-2022071211351.60 ppb
2022-08-03CA2710013_004_004-2022080313451.10 ppb
2022-08-03CA2710013_003_003-202208031403ND
2022-08-03CA2710013_003_003-2022080314101.000 ppb
2022-08-03CA2710013_009_009-2022080313461.000 ppb
2022-10-14CA2710013_009_009-2022101410221.000 ppb
2022-11-28CA2710013_004_004-2022112812051.20 ppb
2022-11-28CA2710013_009_009-2022112812062.10 ppb
2022-11-30CA2710013_003_003-2022113010201.20 ppb
2022-12-08CA2710013_009_009-2022120811444.10 ppb
2023-02-07CA2710013_003_003-2023020714011.000 ppb
2023-02-07CA2710013_004_004-2023020714351.60 ppb
2023-02-07CA2710013_009_009-2023020714361.50 ppb
2023-03-08CA2710013_009_009-2023030811372.50 ppb
2023-04-14CA2710013_009_009-2023041415051.60 ppb
2023-05-02CA2710013_009_009-2023050210222.30 ppb
2023-05-02CA2710013_003_003-202305021048ND
2023-05-02CA2710013_004_004-2023050210211.10 ppb
2023-06-15CA2710013_009_009-202306151209ND
2023-08-10CA2710013_004_004-2023081010361.10 ppb
2023-08-10CA2710013_009_009-2023081010371.40 ppb
2023-08-10CA2710013_003_003-202308101014ND
2023-08-23CA2710013_004_004-202308231314ND
2023-09-13CA2710013_009_009-2023091310431.20 ppb
2023-10-24CA2710013_009_009-2023102413101.40 ppb
2023-11-07CA2710013_004_004-2023110710291.30 ppb
2023-11-07CA2710013_009_009-202311071030ND
2023-11-07CA2710013_003_003-2023110710411.000 ppb