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EWG's Tap Water Database — 2021 UPDATE

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Cobalt

Dover Water Department

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

MORE ABOUT THIS CONTAMINANT

 

36

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.106 ppb352ND - 2.30 ppb
2015ND10ND
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
2014-03-24201403250132AM2.30 ppb
2014-03-24201403250127AMND
2014-03-24201403250143AMND
2014-03-24201403250145AMND
2014-03-25201403270282AMND
2014-03-25201403270318AMND
2014-03-25201403270433AMND
2014-03-25201403270321AMND
2014-03-25201403270437AM1.40 ppb
2014-03-26201403270163AMND
2014-03-26201403270427AMND
2014-03-26201403270306AMND
2014-03-26201403270206AMND
2014-03-26201403270425AMND
2014-03-26201403270429AMND
2014-03-26201403270400AMND
2014-03-31201404010215AMND
2014-09-16201409170855AMND
2014-09-16201409180277AMND
2014-09-16201409170760AMND
2014-09-16201409170752AMND
2014-09-16201409170723AMND
2014-09-17201409190310AMND
2014-09-17201409190318AMND
2014-09-17201409180627AMND
2014-09-17201409180608AMND
2014-09-22201409230467AMND
2014-09-22201409230406AMND
2014-09-22201409230332AMND
2014-09-23201409240385AMND
2014-09-23201409240352AMND
2014-09-23201409240342AMND
2014-09-23201409240394AMND
2014-09-24201409250535AMND
2014-11-24201411250345AMND
2015-03-12201503140140AMND