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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

City of Arvada

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.

 

38

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
20140.0575 ppb122ND - 0.410 ppb
20150.0900 ppb82ND - 0.450 ppb
2016ND70ND
2017ND70ND

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 Result
2012-02-15ND
2012-05-14ND
2013-02-12ND
2013-06-04ND
2014-02-12ND
2014-04-21ND
2014-04-21ND
2014-04-28ND
2014-05-05ND
2014-05-19ND
2014-07-14ND
2014-07-14ND
2014-07-14ND
2014-07-14ND
2014-10-150.280 ppb
2014-10-150.410 ppb
2015-01-050.450 ppb
2015-01-050.270 ppb
2015-02-11ND
2015-05-12ND
2015-06-16ND
2015-08-05ND
2015-08-05ND
2015-11-09ND
2016-02-11ND
2016-05-14ND
2016-06-21ND
2016-08-16ND
2016-08-16ND
2016-10-04ND
2016-11-08ND
2017-02-07ND
2017-05-16ND
2017-06-13ND
2017-08-30ND
2017-08-30ND
2017-10-03ND
2017-11-07ND