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EWG's Tap Water Database — 2019 UPDATE

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Chromium (hexavalent)

Waterloo 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).

 

20

Samples

0

Samples exceeding legal limit (MCL)

15

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
20140.186 ppb2015ND - 1.75 ppb
2015N/A00N/A
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
2014-03-26777001-110500.0350 ppb
2014-03-26777003-110500.137 ppb
2014-03-26776995-11050ND
2014-03-26776991-110501.75 ppb
2014-03-26776989-110500.135 ppb
2014-03-26776993-11050ND
2014-03-26776997-11050ND
2014-03-26776987-110500.132 ppb
2014-03-26776985-110500.0570 ppb
2014-03-26776999-110500.183 ppb
2014-09-16818910-123220.314 ppb
2014-09-16818908-123220.147 ppb
2014-09-16818943-12322ND
2014-09-16818933-123220.156 ppb
2014-09-16818937-123220.0830 ppb
2014-09-16818945-12322ND
2014-09-16818941-123220.187 ppb
2014-09-16818935-123220.153 ppb
2014-09-16818947-123220.0800 ppb
2014-09-16818939-123220.160 ppb