EWG's Tap Water Database — 2019 UPDATE


Chromium (total)

Brown Deer Waterworks

Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20130.188 ppb1713ND - 0.300 ppb
20140.273 ppb660.218 ppb - 0.313 ppb
20150.219 ppb220.214 ppb - 0.223 ppb
20160.500 ppb220.500 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.

ppb = parts per billion

All test results

Date Lab ID Result
2014-05-20790733-115150.218 ppb
2014-06-19798289-116210.313 ppb
2014-08-14810973-121760.298 ppb
2014-08-14810971-121760.257 ppb
2014-11-10830777-129360.297 ppb
2014-11-10830779-129360.253 ppb
2015-02-10842803-134220.223 ppb
2015-02-10842805-134220.214 ppb