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EWG's Tap Water Database — 2021 UPDATE

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Selenium

Valencia Water Company

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.

 

113

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.742 ppb192ND - 7.20 ppb
20151.04 ppb193ND - 8.90 ppb
20160.779 ppb192ND - 8.80 ppb
2017ND190ND
20180.600 ppb182ND - 5.80 ppb
20191.38 ppb194ND - 8.80 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2014-07-029590-021-0800ND
2014-07-029590-052-0800ND
2014-07-029590-062-0835ND
2014-07-099590-005-0800ND
2014-07-099590-018-0810ND
2014-07-099590-024-0925ND
2014-07-099590-026-0845ND
2014-07-099590-058-0850ND
2014-07-169590-017-1120ND
2014-07-169590-025-0910ND
2014-07-169590-046-1030ND
2014-07-169590-049-0800ND
2014-07-169590-051-0830ND
2014-07-169590-070-0945ND
2014-07-239590-003-08157.20 ppb
2014-07-239590-004-0930ND
2014-07-239590-047-0900ND
2014-07-239590-048-09006.90 ppb
2014-07-239590-073-0945ND
2015-07-099590-021-1000ND
2015-07-099590-052-08305.20 ppb
2015-07-099590-062-0930ND
2015-07-169590-005-0955ND
2015-07-169590-018-0915ND
2015-07-169590-024-0830ND
2015-07-169590-026-0925ND
2015-07-169590-058-0942ND
2015-07-239590-017-1104ND
2015-07-239590-025-0932ND
2015-07-239590-046-0945ND
2015-07-239590-049-1002ND
2015-07-239590-051-1034ND
2015-07-239590-070-1015ND
2015-07-309590-003-08108.90 ppb
2015-07-309590-004-0955ND
2015-07-309590-047-1015ND
2015-07-309590-048-09155.70 ppb
2015-07-309590-073-0840ND
2016-07-149590-005-0832ND
2016-07-149590-018-0852ND
2016-07-149590-021-1014ND
2016-07-149590-024-0803ND
2016-07-149590-026-0816ND
2016-07-149590-052-1001ND
2016-07-149590-058-0913ND
2016-07-149590-062-1024ND
2016-07-219590-017-0955ND
2016-07-219590-046-0902ND
2016-07-219590-051-1018ND
2016-07-219590-070-0923ND
2016-07-289590-003-09068.80 ppb
2016-07-289590-004-1007ND
2016-07-289590-025-1105ND
2016-07-289590-047-1016ND
2016-07-289590-048-10306.00 ppb
2016-07-289590-049-0946ND
2016-07-289590-073-0926ND
2017-07-069588-021-0910ND
2017-07-069588-052-0940ND
2017-07-069588-062-0920ND
2017-07-139588-005-0839ND
2017-07-139588-018-0851ND
2017-07-139588-024-0808ND
2017-07-139588-026-0819ND
2017-07-139588-058-0906ND
2017-07-209588-017-1010ND
2017-07-209588-025-0905ND
2017-07-209588-046-0920ND
2017-07-209588-049-0955ND
2017-07-209588-051-1030ND
2017-07-209588-070-0940ND
2017-07-279588-003-0845ND
2017-07-279588-004-0825ND
2017-07-279588-047-0820ND
2017-07-279588-048-0945ND
2017-07-279588-073-0750ND
2018-07-059590-021-0947ND
2018-07-059590-052-10205.00 ppb
2018-07-059590-062-1000ND
2018-07-129590-005-0820ND
2018-07-129590-018-0835ND
2018-07-129590-024-0800ND
2018-07-129590-026-0810ND
2018-07-129590-058-0845ND
2018-07-199590-017-0935ND
2018-07-199590-025-0750ND
2018-07-199590-046-0825ND
2018-07-199590-049-0850ND
2018-07-199590-051-0905ND
2018-07-199590-070-0805ND
2018-07-269590-003-09105.80 ppb
2018-07-269590-004-1010ND
2018-07-269590-047-0955ND
2018-07-269590-073-0850ND
2019-07-109590-005-1045ND
2019-07-109590-018-1115ND
2019-07-109590-024-0910ND
2019-07-109590-026-0945ND
2019-07-109590-058-1140ND
2019-07-119590-021-0925ND
2019-07-119590-052-10456.80 ppb
2019-07-119590-062-10008.80 ppb
2019-07-179590-017-0910ND
2019-07-179590-025-0840ND
2019-07-179590-046-0945ND
2019-07-179590-049-0840ND
2019-07-179590-051-1005ND
2019-07-179590-070-0920ND
2019-07-249590-003-09555.60 ppb
2019-07-249590-004-1010ND
2019-07-249590-047-0930ND
2019-07-249590-073-0915ND
2019-11-219590-048-11205.00 ppb