Menu

EWG's Tap Water Database

Donate

Chromium (hexavalent)

Portland Water Bureau

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).

 

10

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
2013N/A00N/A
20140.0303 ppb97ND - 0.0480 ppb
20150.0890 ppb110.0890 ppb

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 Lab ID Result
2014-03-19201403200265AM0.0370 ppb
2014-03-19201403200340AM0.0340 ppb
2014-06-26201406270434AM0.0400 ppb
2014-06-26201406270313AM0.0370 ppb
2014-07-08201407090732AM0.0480 ppb
2014-09-11201409120957AM0.0460 ppb
2014-09-11201409120826AM0.0310 ppb
2014-12-10201412110822AMND
2014-12-10201412110612AMND
2015-06-17201506180496AM0.0890 ppb