EWG's Tap Water Database — 2019 UPDATE


Chromium (hexavalent)

Charlotte Water

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
20130.0730 ppb110.0730 ppb
20140.0666 ppb23230.0420 ppb - 0.120 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
2013-10-3035114055011AM0.0730 ppb
2014-01-2235123672001AM0.120 ppb
2014-01-2235123672003AM0.0640 ppb
2014-01-2235123672009AM0.0650 ppb
2014-01-2235123672007AM0.0610 ppb
2014-01-2235123672005AM0.0650 ppb
2014-01-3035124487013AM0.0470 ppb
2014-01-3035124487011AM0.0460 ppb
2014-01-3035124487003AM0.0470 ppb
2014-01-3035124487005AM0.0450 ppb
2014-01-3035124487001AM0.0420 ppb
2014-01-3035124487007AM0.0990 ppb
2014-04-2935136065009AM0.0820 ppb
2014-04-2935136065007AM0.0890 ppb
2014-04-2935136065003AM0.0610 ppb
2014-04-2935136065011AM0.0660 ppb
2014-04-2935136065005AM0.0660 ppb
2014-04-2935136065001AM0.0610 ppb
2014-07-3035148391005AM0.0600 ppb
2014-07-3035148391007AM0.0610 ppb
2014-07-3035148391009AM0.0590 ppb
2014-07-3035148391002AM0.0610 ppb
2014-07-3035148391001AM0.1000 ppb
2014-07-3135148391011AM0.0640 ppb