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EWG's Tap Water Database — 2019 UPDATE

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Cobalt

Holden Water Division, DPW

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

 

19

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
20140.110 ppb101ND - 1.10 ppb
20150.200 ppb91ND - 1.80 ppb
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 Result
2014-08-20ND
2014-08-20ND
2014-08-20ND
2014-08-20ND
2014-08-201.10 ppb
2014-08-20ND
2014-08-20ND
2014-08-20ND
2014-11-19ND
2014-11-19ND
2015-02-24ND
2015-02-25ND
2015-02-25ND
2015-02-25ND
2015-02-25ND
2015-02-25ND
2015-02-251.80 ppb
2015-05-27ND
2015-05-27ND