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EWG's Tap Water Database — 2021 UPDATE

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Chromium (total)

Regional Water Authority

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.

MORE ABOUT THIS CONTAMINANT

 

186

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.193 ppb6129ND - 0.840 ppb
20150.167 ppb243ND - 2.00 ppb
20160.0800 ppb252ND - 1.000 ppb
2017ND260ND
2018ND250ND
20190.0800 ppb252ND - 1.000 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 Lab ID Result
2014-01-2135123679005AMND
2014-01-2135123679009AM0.270 ppb
2014-01-2135123679031AMND
2014-01-2135123679003AM0.280 ppb
2014-01-2135123679007AM0.370 ppb
2014-01-2135123679029AM0.330 ppb
2014-01-2135123679037AM0.840 ppb
2014-01-2135123679017AM0.340 ppb
2014-01-2135123679019AM0.270 ppb
2014-01-2135123679001AM0.510 ppb
2014-01-2135123679021AM0.300 ppb
2014-01-2135123679027AMND
2014-01-2135123679035AM0.290 ppb
2014-01-2135123679039AM0.820 ppb
2014-01-2135123679033AM0.300 ppb
2014-01-2135123679016AM0.260 ppb
2014-01-2135123679011AM0.730 ppb
2014-01-2135123679023AMND
2014-01-2135123679013AM0.790 ppb
2014-01-2135123679025AM0.310 ppb
2014-02-24IOCR 200391476ND
2014-02-24IOCR 200391478ND
2014-02-24IOCR 200391480ND
2014-02-24IOCR 200391481ND
2014-02-24IOCR 200391482ND
2014-02-25IOC1 200391599ND
2014-02-25IOC1 200391600ND
2014-02-25IOC1 200391616ND
2014-02-25IOC1 200391617ND
2014-02-25IOC1 200391618ND
2014-02-25IOC1 200391619ND
2014-02-25IOC1 200391620ND
2014-02-25IOC1 200391653ND
2014-02-25IOCR 200391602ND
2014-02-25IOCR 200391603ND
2014-02-25IOCR 200391621ND
2014-02-25IOCR 200391624ND
2014-02-25IOCR 200391625ND
2014-02-26IOCR 200391727ND
2014-03-18IOCR 200392806ND
2014-04-2835135837001AMND
2014-04-2835135837003AMND
2014-04-2835135837005AM0.370 ppb
2014-04-2835135837007AM0.500 ppb
2014-04-2835135837011AM0.250 ppb
2014-04-2835135837009AMND
2014-04-2935136068001AM0.370 ppb
2014-04-2935136068003AM0.230 ppb
2014-05-13IOC1 200395855ND
2014-05-13IOC1 200395860ND
2014-05-13IOCR 200395856ND
2014-05-13IOCR 200395862ND
2014-05-13IOCR 200395863ND
2014-10-2120362620040.290 ppb
2014-10-2120362620010.280 ppb
2014-10-2120362620050.440 ppb
2014-10-2120362620030.340 ppb
2014-10-2120362620080.280 ppb
2014-10-2120362620020.380 ppb
2014-10-2120362620060.490 ppb
2014-10-2120362620070.540 ppb
2015-02-09IOCR 200411809ND
2015-02-09IOCR 200411814ND
2015-02-09IOCR 2004118102.00 ppb
2015-02-09IOCR 200411811ND
2015-02-09IOCR 200411812ND
2015-02-10IOCR 200411877ND
2015-02-10IOC1 2004118591.000 ppb
2015-02-10IOC1 200411862ND
2015-02-10IOC1 200411860ND
2015-02-10IOC1 200411845ND
2015-02-10IOC1 200411846ND
2015-02-10IOC1 200411863ND
2015-02-10IOC1 200411876ND
2015-02-10IOCR 200411866ND
2015-02-10IOCR 200411847ND
2015-02-10IOCR 200411848ND
2015-02-10IOCR 200411864ND
2015-02-11IOCR 200411985ND
2015-05-04IOCR 200415956ND
2015-05-05IOC1 2004161481.000 ppb
2015-05-05IOC1 200416175ND
2015-05-05IOC1 200416168ND
2015-05-05IOCR 200416169ND
2015-05-05IOCR 200416176ND
2016-02-08IOCR 200433335ND
2016-02-08IOCR 200433340ND
2016-02-08IOCR 200433341ND
2016-02-08IOCR 200433336ND
2016-02-08IOCR 200433338ND
2016-02-09IOCR 200433424ND
2016-02-09IOC1 2004334111.000 ppb
2016-02-09IOC1 200433414ND
2016-02-09IOC1 200433412ND
2016-02-09IOC1 2004334131.000 ppb
2016-02-09IOC1 200433479ND
2016-02-09IOC1 200433397ND
2016-02-09IOC1 200433398ND
2016-02-09IOC1 200433415ND
2016-02-09IOC1 200433425ND
2016-02-09IOCR 200433419ND
2016-02-09IOCR 200433418ND
2016-02-09IOCR 200433480ND
2016-02-09IOCR 200433399ND
2016-02-09IOCR 200433400ND
2016-02-09IOCR 200433416ND
2016-02-10IOCR 200433549ND
2016-05-12IOC1 200439513ND
2016-05-12IOCR 200439514ND
2016-11-22IOCR 200455269ND
2017-03-20IOCR 200462640ND
2017-03-20IOCR 200462646ND
2017-03-20IOCR 200462641ND
2017-03-20IOCR 200462642ND
2017-03-20IOCR 200462645ND
2017-03-21IOCR 200462775ND
2017-03-21IOC1 200462739ND
2017-03-21IOC1 200462742ND
2017-03-21IOC1 200462740ND
2017-03-21IOC1 200462741ND
2017-03-21IOC1 200462793ND
2017-03-21IOC1 200462756ND
2017-03-21IOC1 200462757ND
2017-03-21IOC1 200462743ND
2017-03-21IOC1 200462777ND
2017-03-21IOCR 200462833ND
2017-03-21IOCR 200462794ND
2017-03-21IOCR 200462795ND
2017-03-21IOCR 200462758ND
2017-03-21IOCR 200462759ND
2017-03-21IOCR 200462744ND
2017-06-19IOCR 200469686ND
2017-06-20IOC1 200469812ND
2017-06-20IOC1 200469827ND
2017-06-20IOCR 200469828ND
2017-06-20IOCR 200469813ND
2018-03-12IOC1 200489766ND
2018-03-12IOCR 200489760ND
2018-03-12IOCR 200489758ND
2018-03-12IOCR 200489759ND
2018-03-12IOCR 200489767ND
2018-03-14IOCR 200489911ND
2018-03-14IOC1 200489867ND
2018-03-14IOC1 200489870ND
2018-03-14IOC1 200489868ND
2018-03-14IOC1 200489884ND
2018-03-14IOC1 200489885ND
2018-03-14IOC1 200489871ND
2018-03-14IOC1 200489913ND
2018-03-14IOC1 200489914ND
2018-03-14IOCR 200489898ND
2018-03-14IOCR 200489900ND
2018-03-14IOCR 200489896ND
2018-03-14IOCR 200489912ND
2018-03-14IOCR 200489886ND
2018-03-14IOCR 200489887ND
2018-03-14IOCR 200489872ND
2018-03-14IOCR 200489897ND
2018-03-15IOCR 200490063ND
2018-11-29IOC1 200514112ND
2018-11-29IOCR 200514114ND
2019-03-18IOC1 200524895ND
2019-03-18IOCR 200524903ND
2019-03-18IOCR 200524901ND
2019-03-18IOCR 2005249021.000 ppb
2019-03-18IOCR 200524905ND
2019-03-18IOCR 200524900ND
2019-03-19IOCR 200525095ND
2019-03-19IOC1 200525057ND
2019-03-19IOC1 200525060ND
2019-03-19IOC1 200525058ND
2019-03-19IOC1 200525059ND
2019-03-19IOC1 200525077ND
2019-03-19IOC1 200525078ND
2019-03-19IOC1 200525061ND
2019-03-19IOC1 200525097ND
2019-03-19IOC1 200525098ND
2019-03-19IOCR 200525065ND
2019-03-19IOCR 2005250661.000 ppb
2019-03-19IOCR 200525064ND
2019-03-19IOCR 200525096ND
2019-03-19IOCR 200525079ND
2019-03-19IOCR 200525080ND
2019-03-19IOCR 200525062ND
2019-05-08IOC1 200531297ND
2019-05-08IOCR 200531303ND