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EWG's Tap Water Database

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Cobalt

Portland Water Bureau

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

 

10

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
2014ND90ND
2015ND10ND

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
2014-03-19201403200265AMND
2014-03-19201403200340AMND
2014-06-26201406270434AMND
2014-06-26201406270313AMND
2014-07-08201407090732AMND
2014-09-11201409120957AMND
2014-09-11201409120826AMND
2014-12-10201412110822AMND
2014-12-10201412110612AMND
2015-06-17201506180496AMND