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EWG's Tap Water Database — 2019 UPDATE

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Chromium (hexavalent)

City of Black Hawk

Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).

 

16

Samples

0

Samples exceeding legal limit (MCL)

16

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
20130.123 ppb440.0970 ppb - 0.168 ppb
20140.0964 ppb12120.0440 ppb - 0.125 ppb
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.02 ppb

The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Result
2013-10-150.168 ppb
2013-10-150.102 ppb
2013-10-150.0970 ppb
2013-10-150.125 ppb
2014-01-070.0930 ppb
2014-01-070.108 ppb
2014-01-070.116 ppb
2014-01-070.117 ppb
2014-04-070.0950 ppb
2014-04-070.125 ppb
2014-04-070.106 ppb
2014-04-070.1000 ppb
2014-07-220.0810 ppb
2014-07-220.0600 ppb
2014-07-220.112 ppb
2014-07-220.0440 ppb