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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

Marshall 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.

 

11

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND30ND
2014ND40ND
2015N/A00N/A
2016N/A00N/A
2017ND40ND

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
2013-08-30E130804750ND
2013-08-30E130804726ND
2013-08-30E130804738ND
2014-07-08E140601327ND
2014-07-08E140601323ND
2014-10-28E140802400ND
2014-10-28E140802404ND
2017-07-31E170600344ND
2017-07-31E170600339ND
2017-12-06E170805501ND
2017-12-06E170805506ND