EWG's Tap Water Database — 2019 UPDATE


Chromium (hexavalent)

New York City 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).





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20130.0442 ppb660.0390 ppb - 0.0560 ppb
20140.0411 ppb18180.0330 ppb - 0.0540 ppb
20150.0393 ppb65ND - 0.0570 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
2013-12-10201312110762AM0.0500 ppb
2013-12-10201312110816AM0.0390 ppb
2013-12-10201312110609AM0.0400 ppb
2013-12-10201312110565AM0.0560 ppb
2013-12-10201312110548AM0.0400 ppb
2013-12-10201312110711AM0.0400 ppb
2014-03-11201403120478AM0.0400 ppb
2014-03-11201403120556AM0.0390 ppb
2014-03-11201403120550AM0.0380 ppb
2014-03-11201403120580AM0.0400 ppb
2014-03-11201403120582AM0.0540 ppb
2014-03-11201403120608AM0.0360 ppb
2014-06-24201406250381AM0.0420 ppb
2014-06-24201406250133AM0.0350 ppb
2014-06-24201406250135AM0.0400 ppb
2014-06-24201406250148AM0.0440 ppb
2014-06-24201406250156AM0.0490 ppb
2014-06-24201406250127AM0.0350 ppb
2014-09-23201409240447AM0.0350 ppb
2014-09-23201409240450AM0.0370 ppb
2014-09-23201409240402AM0.0330 ppb
2014-09-23201409240346AM0.0390 ppb
2014-09-23201409240312AM0.0530 ppb
2014-09-23201409240320AM0.0500 ppb
2015-06-25201505020409AM0.0570 ppb
2015-06-25201505020407AM0.0510 ppb
2015-09-23201508080114AM0.0520 ppb
2015-09-23201508080112AM0.0430 ppb
2015-12-08201511070108AM0.0330 ppb