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EWG's Tap Water Database — 2019 UPDATE

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Cobalt

California Water Service Company - Dominguez

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

 

39

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
2014ND310ND
2015ND80ND
2016N/A00N/A
2017N/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
2014-04-02201404030195AMND
2014-04-02201404030204AMND
2014-04-02201404030189AMND
2014-04-02201404030213AMND
2014-04-09201404100037AMND
2014-04-09201404100025AMND
2014-04-09201404100019AMND
2014-04-09201404100047AMND
2014-04-16201404161022AMND
2014-04-16201404161004AMND
2014-04-16201404161013AMND
2014-04-23201404230775AMND
2014-04-23201404230764AMND
2014-07-09201407100239AMND
2014-07-09201407100247AMND
2014-07-16201407160940AMND
2014-07-16201407160949AMND
2014-07-16201407160955AMND
2014-07-17201407170898AMND
2014-07-17201407170889AMND
2014-10-01201410010702AMND
2014-10-01201410010682AMND
2014-10-15201410160127AMND
2014-10-15201410160151AMND
2014-10-15201410160142AMND
2014-10-15201410160133AMND
2014-10-22201410220563AMND
2014-10-22201410220555AMND
2014-10-22201410220541AMND
2014-10-29201410290732AMND
2014-11-12201411130315AMND
2015-01-07201501070700AMND
2015-01-07201501080025AMND
2015-01-08201501080795AMND
2015-01-08201501080801AMND
2015-01-14201501141005AMND
2015-01-14201501141018AMND
2015-01-14201501150026AMND
2015-01-14201501141131AMND