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EWG's Tap Water Database — 2019 UPDATE

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Chromium (hexavalent)

Signal Hill - City, 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).

 

16

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
20140.0109 ppb124ND - 0.0370 ppb
20150.0155 ppb42ND - 0.0320 ppb
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 Lab ID Result
2014-05-154E15062-05A0.0300 ppb
2014-05-154E15062-07AND
2014-05-154E15062-01AND
2014-05-154E15062-03A0.0310 ppb
2014-08-254H25076-03AND
2014-08-254H25076-05AND
2014-08-254H25076-01AND
2014-10-239588-005-0940ND
2014-11-104K10086-03A0.0330 ppb
2014-11-104K10086-07AND
2014-11-104K10086-05AND
2014-11-104K10086-01A0.0370 ppb
2015-02-245B24073-03AND
2015-02-245B24073-05A0.0320 ppb
2015-02-245B24073-01A0.0300 ppb
2015-03-269588-006-1140ND