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EWG's Tap Water Database — 2021 UPDATE

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Cobalt

California Water Service - Stockton

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

MORE ABOUT THIS CONTAMINANT

 

39

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND350ND
2015ND40ND
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
2014-01-09201401100145AMND
2014-01-09201401100156AMND
2014-01-09201401100115AMND
2014-01-09201401100106AMND
2014-01-14201401150353AMND
2014-01-14201401150369AMND
2014-01-14201401150485AMND
2014-01-14201401150331AMND
2014-01-14201401150321AMND
2014-01-14201401150648AMND
2014-01-16201401170464AMND
2014-01-16201401170406AMND
2014-01-16201401170451AMND
2014-01-22201401230166AMND
2014-04-21201404220224AMND
2014-04-21201404220289AMND
2014-04-21201404220216AMND
2014-04-21201404220358AMND
2014-07-07201407090855AMND
2014-07-08201407090708AMND
2014-07-08201407090769AMND
2014-07-08201407090789AMND
2014-07-08201407090776AMND
2014-07-08201407090755AMND
2014-07-08201407090752AMND
2014-07-14201407150352AMND
2014-07-15201407160593AMND
2014-07-15201407160565AMND
2014-07-15201407160582AMND
2014-07-23201407240447AMND
2014-08-27201408280741AMND
2014-10-08201410090337AMND
2014-10-08201410090297AMND
2014-10-08201410090372AMND
2014-11-12201411130683AMND
2015-01-07201501080582AMND
2015-01-08201501090540AMND
2015-06-03201506040496AMND
2015-09-16201509170573AMND