EWG's Tap Water Database — 2019 UPDATE


Chromium (hexavalent)

Golden State Water Company (GSWC) - South Arcadia

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).





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20133.50 ppb990.600 ppb - 7.20 ppb
20142.85 ppb1614ND - 7.50 ppb
20152.80 ppb21ND - 5.60 ppb
20164.60 ppb221.60 ppb - 7.60 ppb
20176.10 ppb332.60 ppb - 7.90 ppb

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
2013-12-183L19003-07A0.600 ppb
2013-12-183L19003-03A0.700 ppb
2013-12-183L19003-05A1.70 ppb
2013-12-183L19003-09A5.10 ppb
2013-12-183L19003-17A7.20 ppb
2013-12-183L19003-01A7.20 ppb
2013-12-183L19003-13A0.810 ppb
2013-12-183L19003-11A7.00 ppb
2013-12-183L19003-15A1.20 ppb
2014-06-244F24039-17A2.30 ppb
2014-06-244F24039-11A2.30 ppb
2014-06-244F24039-15A0.660 ppb
2014-06-244F24039-07A0.670 ppb
2014-06-244F24039-13A1.000 ppb
2014-06-244F24039-03A0.630 ppb
2014-06-244F24039-01A2.40 ppb
2014-06-244F24039-05A1.80 ppb
2014-06-244F24039-09A5.90 ppb
2014-11-059588-015-09554.40 ppb
2014-11-059588-006-09451.90 ppb
2014-11-059588-004-10207.10 ppb
2014-11-059588-002-10357.50 ppb
2014-11-179588-003-12007.00 ppb
2015-08-149588-015-10355.60 ppb
2016-05-119588-005-11051.60 ppb
2016-06-229588-002-09107.60 ppb
2017-08-109588-004-10107.80 ppb
2017-08-109588-003-10007.90 ppb
2017-08-299588-006-10452.60 ppb