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EWG's Tap Water Database — 2021 UPDATE

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Chromium (hexavalent)

Golden State Water Company (GSWC) - Norwalk

Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).

 

28

Samples

0

Samples exceeding legal limit (MCL)

25

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20130.838 ppb880.0590 ppb - 1.80 ppb
20141.74 ppb2017ND - 9.00 ppb
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.02 ppb

The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Lab ID Result
2013-10-18201310180555AM1.10 ppb
2013-10-18201310180549AM0.0670 ppb
2013-10-18201310180553AM0.710 ppb
2013-10-18201310180551AM1.80 ppb
2013-10-18201310180545AM1.70 ppb
2013-10-18201310180541AM0.760 ppb
2013-10-18201310180543AM0.510 ppb
2013-10-18201310180547AM0.0590 ppb
2014-01-17201401180031AMND
2014-01-17201401180029AM1.000 ppb
2014-01-17201401180033AMND
2014-04-17201404180109AM0.760 ppb
2014-04-17201404180113AM1.90 ppb
2014-04-17201404180121AM0.790 ppb
2014-04-17201404180123AM5.90 ppb
2014-04-17201404180119AM2.20 ppb
2014-04-17201404180115AM0.0380 ppb
2014-04-17201404180117AM0.0670 ppb
2014-04-17201404180111AM1.30 ppb
2014-06-04201406050293AM9.00 ppb
2014-07-17201407170807AM0.0580 ppb
2014-07-17201407170809AM0.0590 ppb
2014-12-032706-010-0900ND
2014-12-032706-007-12384.30 ppb
2014-12-032706-004-10151.60 ppb
2014-12-032706-003-09201.90 ppb
2014-12-032706-002-10302.40 ppb
2014-12-162706-009-11231.60 ppb