EWG's Tap Water Database — 2019 UPDATE


Chromium (total)

St. Louis City

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
20121.75 ppb221.68 ppb - 1.82 ppb
20131.24 ppb15150.940 ppb - 1.57 ppb
20141.27 ppb551.07 ppb - 1.53 ppb
20151.46 ppb221.42 ppb - 1.50 ppb
20161.26 ppb221.26 ppb - 1.26 ppb
20171.69 ppb221.58 ppb - 1.79 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
2012-11-14AB873131.82 ppb
2012-11-14AB873141.68 ppb
2013-04-03AB946721.000 ppb
2013-04-03AB946761.14 ppb
2013-04-03AB946781.01 ppb
2013-04-23AB963711.02 ppb
2013-04-23AB963690.940 ppb
2013-04-23AB963671.05 ppb
2013-04-23AB963650.960 ppb
2013-07-16AC051341.42 ppb
2013-07-16AC051361.57 ppb
2013-07-16AC051381.44 ppb
2013-07-16AC051401.50 ppb
2013-10-14AC136611.34 ppb
2013-10-14AC136591.46 ppb
2013-12-02CRCW120213IOC1.30 ppb
2013-12-02HBBC120213IOC1.40 ppb
2014-02-03AC180201.20 ppb
2014-02-11AC194801.34 ppb
2014-02-11AC194811.53 ppb
2014-05-28AC234361.19 ppb
2014-05-28AC234351.07 ppb
2015-05-29CRCW052915IOC1.42 ppb
2015-05-29HBCB052915IOC1.50 ppb
2016-07-19HBCB071916IOC1.26 ppb
2016-07-19CRCW071916IOC1.26 ppb
2017-08-16CRCW081617IOC1.58 ppb
2017-08-16HBBC081617IOC1.79 ppb