Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Chromium (total)

Waterloo Water Works

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.

 

29

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND90ND
2013N/A00N/A
20140.110 ppb203ND - 1.72 ppb
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A

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
2012-03-211894133ND
2012-03-211894140ND
2012-03-211894139ND
2012-03-211894138ND
2012-03-211894137ND
2012-03-211894136ND
2012-03-211894135ND
2012-03-211894134ND
2012-03-281894153ND
2014-03-26776999-111000.219 ppb
2014-03-26776993-11100ND
2014-03-26776991-111001.72 ppb
2014-03-26776997-11100ND
2014-03-26776995-11100ND
2014-03-26776987-11100ND
2014-03-26777003-11100ND
2014-03-26776989-11100ND
2014-03-26777001-11100ND
2014-03-26776985-11100ND
2014-09-16818943-12490ND
2014-09-16818947-12490ND
2014-09-16818945-12490ND
2014-09-16818937-12490ND
2014-09-16818935-12490ND
2014-10-22827630-12847ND
2014-10-22827632-12847ND
2014-10-22827626-128470.255 ppb
2014-10-22827628-12847ND
2014-10-22827624-12847ND