Menu

EWG's Tap Water Database

Donate

Cobalt

Clearwater Water System

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

 

18

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
2013ND70ND
2014ND100ND
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 Result
2013-12-06ND
2013-12-10ND
2013-12-11ND
2013-12-16ND
2013-12-16ND
2013-12-17ND
2013-12-18ND
2014-03-18ND
2014-03-18ND
2014-06-23ND
2014-06-23ND
2014-06-23ND
2014-06-24ND
2014-06-24ND
2014-06-24ND
2014-09-24ND
2014-10-09ND
2015-08-05ND