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EWG's Tap Water Database — 2021 UPDATE

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Chromium (total)

Orange County WCID 1

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
20140.0613 ppb82ND - 0.270 ppb
2015N/A00N/A
2016N/A00N/A
2017ND30ND
2018N/A00N/A
2019N/A00N/A

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
2014-04-17AC51022ND
2014-04-17AC51023ND
2014-05-1935138784005AM0.220 ppb
2014-05-1935138784001AM0.270 ppb
2014-07-07351450460011AMND
2014-11-1435164355001AMND
2014-11-1435164355003AMND
2014-11-1435164355005AMND
2017-02-21AD71204ND
2017-02-21AD71205ND
2017-05-23AD85158ND