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EWG's Tap Water Database — 2021 UPDATE

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Cobalt

California Water Service Company - East Los Angeles

Cobalt is a metal found throughout the environment; people may be exposed to cobalt in air, food and drinking water.

MORE ABOUT THIS CONTAMINANT

 

38

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND290ND
2015ND90ND
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 70 ppb

The EWG Health Guideline of 70 ppb for cobalt was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against change in blood chemistry.

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-11201402110635AMND
2014-02-11201402110509AMND
2014-02-11201402110485AMND
2014-02-11201402110499AMND
2014-02-11201402110637AMND
2014-02-18201402190139AMND
2014-02-18201402180282AMND
2014-02-18201402180276AMND
2014-02-18201402180316AMND
2014-02-18201402180270AMND
2014-03-10201403100287AMND
2014-05-05201405050301AMND
2014-05-05201405050254AMND
2014-05-12201405120234AMND
2014-08-04201408040361AMND
2014-08-04201408040418AMND
2014-08-04201408040409AMND
2014-08-04201408040394AMND
2014-08-04201408040381AMND
2014-08-04201408040389AMND
2014-08-04201408040370AMND
2014-08-06201408060800AMND
2014-08-06201408060722AMND
2014-08-06201408060809AMND
2014-08-06201408060791AMND
2014-08-06201408060730AMND
2014-11-03201411030328AMND
2014-11-03201411030368AMND
2014-11-03201411030299AMND
2015-02-09201502090126AMND
2015-02-09201502090460AMND
2015-02-09201502090299AMND
2015-02-09201502090456AMND
2015-02-10201502100665AMND
2015-08-10201508100287AMND
2015-08-10201508100290AMND
2015-08-17201508170413AMND
2015-08-17201508170246AMND