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EWG's Tap Water Database

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Cobalt

City of Chicago

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

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010N/A00N/A
2011N/A00N/A
2012N/A00N/A
2013N/A00N/A
2014ND120ND
2015ND40ND

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 70 ppb

The 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
2014-04-283015708ND
2014-04-283015741ND
2014-04-283015718ND
2014-04-283015757ND
2014-08-133081726ND
2014-08-133081734ND
2014-08-133081749ND
2014-08-133081746ND
2014-10-073118988ND
2014-10-073118973ND
2014-10-073118992ND
2014-10-073118977ND
2015-01-133169401ND
2015-01-133169381ND
2015-01-133169534ND
2015-01-133169538ND