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EWG's Tap Water Database

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Chromium (hexavalent)

Clearwater Water System

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).

 

17

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010N/A00N/A
2011N/A00N/A
2012N/A00N/A
20130.0483 ppb770.0330 ppb - 0.0610 ppb
20140.0617 ppb98ND - 0.1000 ppb
2015ND10ND

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 0.02 ppb

The 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
2013-12-060.0500 ppb
2013-12-100.0380 ppb
2013-12-110.0330 ppb
2013-12-160.0610 ppb
2013-12-160.0550 ppb
2013-12-170.0490 ppb
2013-12-180.0520 ppb
2014-04-100.0540 ppb
2014-06-230.0440 ppb
2014-06-230.0740 ppb
2014-06-230.0660 ppb
2014-06-240.0680 ppb
2014-06-240.0780 ppb
2014-06-24ND
2014-09-240.0710 ppb
2014-09-240.1000 ppb
2015-08-05ND