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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

Grayson Utility Commission

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND10ND
20140.143 ppb74ND - 0.300 ppb
2015ND30ND
2016ND10ND
2017ND10ND

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
2012-04-03201203935001ND
2013-04-02201304270001ND
2014-04-01201404689001ND
2014-05-27201405300374AMND
2014-05-27201405300372AMND
2014-08-12201408150286AM0.210 ppb
2014-08-12201408150288AM0.230 ppb
2014-11-18201411210216AM0.300 ppb
2014-11-18201411210214AM0.260 ppb
2015-02-03201502060285AMND
2015-02-03201502060287AMND
2015-04-07201504208001ND
2016-04-05201604665001ND
2017-04-04201704768001ND