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EWG's Tap Water Database — 2021 UPDATE

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Cobalt

Cal-water Service Company - Chico

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

MORE ABOUT THIS CONTAMINANT

 

94

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND270ND
2014ND640ND
2015ND30ND
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
2013-07-08201307090265AMND
2013-07-09201307100960AMND
2013-07-10201307110718AMND
2013-07-10201307110727AMND
2013-07-23201307240451AMND
2013-07-24201307250295AMND
2013-08-05201308060206AMND
2013-08-05201308060171AMND
2013-08-07201308080253AMND
2013-08-07201308080294AMND
2013-08-14201308150373AMND
2013-08-14201308150416AMND
2013-08-14201308150516AMND
2013-08-20201308210528AMND
2013-08-20201308210542AMND
2013-08-21201308220195AMND
2013-08-21201308220225AMND
2013-08-27201308290350AMND
2013-09-17201309180524AMND
2013-09-17201309180767AMND
2013-09-17201309180757AMND
2013-09-18201309200061AMND
2013-10-08201310090667AMND
2013-10-08201310090470AMND
2013-10-08201310090479AMND
2013-10-15201310160273AMND
2013-10-15201310160227AMND
2014-01-07201401080499AMND
2014-01-07201401080518AMND
2014-01-08201401090452AMND
2014-01-14201401150420AMND
2014-01-14201401150437AMND
2014-01-21201401220305AMND
2014-01-22201401230384AMND
2014-01-22201401230435AMND
2014-01-28201401290598AMND
2014-02-11201402120780AMND
2014-02-11201402120797AMND
2014-02-11201402120771AMND
2014-02-11201402120799AMND
2014-02-11201402120762AMND
2014-02-12201402130426AMND
2014-02-12201402130407AMND
2014-02-12201402130417AMND
2014-02-19201402200380AMND
2014-02-26201402270199AMND
2014-02-26201402270250AMND
2014-02-28201403010098AMND
2014-03-04201403050734AMND
2014-03-04201403050606AMND
2014-03-04201403050445AMND
2014-03-04201403050466AMND
2014-03-05201403060273AMND
2014-03-17201403180362AMND
2014-03-17201403180218AMND
2014-03-17201403180311AMND
2014-03-18201403190854AMND
2014-03-18201403190839AMND
2014-04-08201404090695AMND
2014-04-08201404090547AMND
2014-04-08201404090704AMND
2014-04-09201404100813AMND
2014-04-09201404100693AMND
2014-04-09201404100714AMND
2014-04-09201404100766AMND
2014-04-09201404100738AMND
2014-04-22201404230455AMND
2014-04-23201404240507AMND
2014-04-23201404240400AMND
2014-06-18201406190413AMND
2014-07-09201407100477AMND
2014-07-09201407100535AMND
2014-07-14201407150440AMND
2014-08-05201408060341AMND
2014-08-05201408060311AMND
2014-08-05201408060375AMND
2014-08-06201408070483AMND
2014-09-09201409100881AMND
2014-09-09201409110323AMND
2014-09-09201409110344AMND
2014-09-10201409110683AMND
2014-09-10201409110779AMND
2014-09-23201409240601AMND
2014-09-24201409250608AMND
2014-10-07201410080394AMND
2014-10-07201410080329AMND
2014-10-08201410090318AMND
2014-10-15201410160406AMND
2014-10-27201410290065AMND
2014-10-27201410280387AMND
2014-12-09201412100749AMND
2015-01-13201501140882AMND
2015-03-25201503260846AMND
2015-08-17201508190229AMND