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EWG's Tap Water Database — 2019 UPDATE

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Chromium (total)

Port Washington Waterworks

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND10ND
20140.1000 ppb31ND - 0.300 ppb
20150.420 ppb550.200 ppb - 1.000 ppb
20160.700 ppb110.700 ppb
20170.500 ppb110.500 ppb

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
2012-04-252630415-16ND
2013-04-222812648-49ND
2014-04-083004182-83ND
2014-10-1531236610.300 ppb
2014-11-033132687ND
2015-01-1231684280.300 ppb
2015-01-1231685400.300 ppb
2015-04-073219659-601.000 ppb
2015-07-0632742500.200 ppb
2015-07-0632742590.300 ppb
2016-05-053443037-380.700 ppb
2017-04-193677792-930.500 ppb