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EWG's Tap Water Database — 2021 UPDATE

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Chromium (hexavalent)

Butte-Silver Bow Water Department

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).

MORE ABOUT THIS CONTAMINANT

 

28

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20130.00821 ppb123ND - 0.0363 ppb
20140.00945 ppb123ND - 0.0413 ppb
2015ND30ND
2016ND10ND
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 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 Lab ID Result
2013-07-10201303437ND
2013-07-10201303441ND
2013-07-10201303447ND
2013-07-102013034390.0316 ppb
2013-07-10201303445ND
2013-07-102013034430.0306 ppb
2013-10-17201305600ND
2013-10-17201305594ND
2013-10-17201305598ND
2013-10-17201305596ND
2013-10-30201305879ND
2013-10-302013058810.0363 ppb
2014-01-16201400289ND
2014-01-162014002910.0310 ppb
2014-01-16201400283ND
2014-01-16201400287ND
2014-01-16201400285ND
2014-01-16201400293ND
2014-04-28201401601ND
2014-04-28201401607ND
2014-04-28201401603ND
2014-04-282014016050.0411 ppb
2014-04-28201401597ND
2014-04-282014015990.0413 ppb
2015-11-19201507028ND
2015-11-19201507027ND
2015-11-19201507026ND
2016-02-10201600494ND