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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

East Rio Hondo WSC

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.26 ppb331.13 ppb - 1.44 ppb
20130.0259 ppb81ND - 0.207 ppb
2014ND30ND
2015ND10ND
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
2012-01-1012011930021.44 ppb
2012-07-1712075910031.22 ppb
2012-07-1712075910041.13 ppb
2013-09-10AC29587ND
2013-09-30Q1308427015ND
2013-09-30Q1308427005ND
2013-09-30Q1308427009ND
2013-09-30Q1308427001ND
2013-09-30Q1308427013ND
2013-12-19Q13190420010.207 ppb
2013-12-19Q1319042005ND
2014-03-06AC45918ND
2014-09-09Q1442416001ND
2014-09-09Q1442416003ND
2015-03-18AC84945ND
2016-02-25AD25623ND
2017-03-03AD73387ND