Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Cobalt

Golden State Water Company (GSWC) - Norwalk

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

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND80ND
2014ND140ND
2015N/A00N/A
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
2013-10-18201310180541AMND
2013-10-18201310180547AMND
2013-10-18201310180551AMND
2013-10-18201310180543AMND
2013-10-18201310180545AMND
2013-10-18201310180549AMND
2013-10-18201310180555AMND
2013-10-18201310180553AMND
2014-01-17201401180031AMND
2014-01-17201401180029AMND
2014-01-17201401180033AMND
2014-04-17201404180111AMND
2014-04-17201404180115AMND
2014-04-17201404180117AMND
2014-04-17201404180123AMND
2014-04-17201404180119AMND
2014-04-17201404180121AMND
2014-04-17201404180113AMND
2014-04-17201404180109AMND
2014-06-04201406050293AMND
2014-07-17201407170809AMND
2014-07-17201407170807AMND