EWG's Tap Water Database — 2019 UPDATE


Chromium (hexavalent)

Philadelphia 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).





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20130.403 ppb18180.220 ppb - 0.750 ppb
20140.343 ppb660.300 ppb - 0.420 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
2013-05-0810263320100.370 ppb
2013-05-0810263320050.390 ppb
2013-05-0810263320030.260 ppb
2013-05-0810263320010.270 ppb
2013-05-0810263320130.220 ppb
2013-05-0810263320070.280 ppb
2013-08-0510409090050.750 ppb
2013-08-0510409090070.350 ppb
2013-08-0510409090010.470 ppb
2013-08-0510409090030.360 ppb
2013-08-0510409090130.380 ppb
2013-08-0510409090100.720 ppb
2013-11-0510573350010.350 ppb
2013-11-0510573350050.610 ppb
2013-11-0510573350100.650 ppb
2013-11-0510573350030.260 ppb
2013-11-0510573350130.240 ppb
2013-11-0510573350070.330 ppb
2014-02-04201402060425AM0.370 ppb
2014-02-04201402060557AM0.300 ppb
2014-02-04201402060401AM0.340 ppb
2014-02-04201402060429AM0.320 ppb
2014-02-04201402060553AM0.310 ppb
2014-02-04201402060555AM0.420 ppb