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EWG's Tap Water Database — 2019 UPDATE

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Cobalt

Oak Park Water Service

NOTE: Oak Park Water Service purchases water from Calleguas Municipal Water District which is required to test for cobalt. Sample information shown below was taken by Calleguas Municipal Water District.

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

 

0

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
2014N/A00N/A
2015ND80ND
2016N/A00N/A
2017N/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

NOTE: Oak Park Water Service purchases water from Calleguas Municipal Water District which is required to test for cobalt. Sample information shown below was taken by Calleguas Municipal Water District.

Date Lab ID Result