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EWG's Tap Water Database — 2019 UPDATE

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Chromium (hexavalent)

Madison Water Works

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).

 

12

Samples

0

Samples exceeding legal limit (MCL)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
20140.640 ppb660.270 ppb - 0.850 ppb
20150.867 ppb660.610 ppb - 1.000 ppb
2016N/A00N/A
2017N/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
2014-08-1930862020.790 ppb
2014-08-1930863540.850 ppb
2014-08-1930863620.320 ppb
2014-08-1930862260.270 ppb
2014-12-1735168426002AM0.770 ppb
2014-12-1735168426001AM0.840 ppb
2015-02-1035175254007AM0.980 ppb
2015-02-1035175254003AM0.960 ppb
2015-02-1035175254001AM0.710 ppb
2015-02-1035175254005AM1.000 ppb
2015-05-1435188657003AM0.940 ppb
2015-05-1435188657001AM0.610 ppb