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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

City of Columbia

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.

 

29

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
20140.109 ppb104ND - 0.300 ppb
20150.134 ppb105ND - 0.300 ppb
2016ND20ND
2017ND30ND

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
2012-02-06AD02307ND
2012-02-06AD02308ND
2013-01-30AD19088ND
2013-01-30AD19089ND
2014-01-15AD34535ND
2014-01-15AD34536ND
2014-07-14201407160691AMND
2014-07-14201407160604AMND
2014-07-14201407160557AMND
2014-07-14201407160626AMND
2014-10-14201410160417AM0.300 ppb
2014-10-14201410160419AM0.300 ppb
2014-10-28201410300179AM0.260 ppb
2014-10-28201410300184AM0.230 ppb
2015-01-13201501150478AMND
2015-01-13201501150451AMND
2015-01-13201501150661AM0.200 ppb
2015-01-13201501150679AM0.300 ppb
2015-01-15AD50347ND
2015-01-15AD50348ND
2015-04-14201504160447AM0.300 ppb
2015-04-14201504160290AM0.270 ppb
2015-04-14201504160335AM0.270 ppb
2015-04-14201504160399AMND
2016-01-13AD69192ND
2016-01-13AD69191ND
2017-01-17AD88356ND
2017-03-07AD90717ND
2017-08-02AD98392ND