EWG's Tap Water Database — 2019 UPDATE


Chromium (hexavalent)

Newhall CWD-Newhall

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).





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20130.696 ppb10100.1000 ppb - 1.40 ppb
20141.25 ppb221.20 ppb - 1.30 ppb
20171.15 ppb221.000 ppb - 1.30 ppb

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
2013-02-21201302210756AM1.40 ppb
2013-02-21201302210758AM0.860 ppb
2013-02-21201302210760AM0.460 ppb
2013-05-16201305160497AM0.730 ppb
2013-05-16201305160550AM0.1000 ppb
2013-08-22201308220427AM1.20 ppb
2013-08-22201308220423AM0.850 ppb
2013-08-22201308220425AM0.290 ppb
2013-11-21201311220118AM0.710 ppb
2013-11-21201311220104AM0.360 ppb
2014-10-139590-006-09561.30 ppb
2014-10-139590-007-10301.20 ppb
2017-03-099590-006-11301.30 ppb
2017-03-099590-007-11401.000 ppb