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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

Miramar (East & West) Plants

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
20140.0638 ppb82ND - 0.270 ppb
2015ND20ND
20160.1000 ppb21ND - 0.200 ppb
20170.250 ppb21ND - 0.500 ppb

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
2012-09-13ND
2012-09-13ND
2013-09-10ND
2013-09-10ND
2014-01-13ND
2014-01-13ND
2014-01-130.240 ppb
2014-07-10ND
2014-07-10ND
2014-07-100.270 ppb
2014-09-09ND
2014-09-09ND
2015-09-09ND
2015-09-09ND
2016-09-13ND
2016-09-130.200 ppb
2017-09-29ND
2017-09-290.500 ppb