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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

Three Valleys Municipal Water District

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND10ND
2014ND20ND
2015ND20ND
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
2012-03-213761-002-1100ND
2012-07-183761-004-0752ND
2013-03-053761-002-1040ND
2014-03-113761-002-1030ND
2014-08-263761-004-1000ND
2015-03-103761-002-0930ND
2015-07-143761-004-0832ND
2016-03-153761-002-0900ND
2016-07-193761-004-0945ND
2017-03-213761-002-0730ND
2017-05-163761-004-0900ND
2017-07-183761-004-0900ND