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EWG's Tap Water Database — 2021 UPDATE

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Chromium (total)

Marco Rural Water Company

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.

MORE ABOUT THIS CONTAMINANT

 

32

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND160ND
2014N/A00N/A
2015N/A00N/A
2016ND80ND
2017N/A00N/A
2018N/A00N/A
2019ND80ND

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
2013-05-20201305220622AMND
2013-05-20201305220450AMND
2013-05-20201305230203AMND
2013-05-20201305230001AMND
2013-05-20201305220645AMND
2013-05-20201305220452AMND
2013-05-20201305220625AMND
2013-05-20201305220627AMND
2013-10-29201310310144AMND
2013-10-29201310310154AMND
2013-10-29201310310167AMND
2013-10-29201310310129AMND
2013-10-29201310310169AMND
2013-10-29201310310102AMND
2013-10-29201310310142AMND
2013-10-29201310310146AMND
2016-03-09AD72144ND
2016-11-08AD85403ND
2016-11-08AD85422ND
2016-11-08AD85395ND
2016-11-08AD85412ND
2016-11-08AD85401ND
2016-11-08AD85416ND
2016-11-08AD85399ND
2019-12-02AE40929ND
2019-12-02AE40915ND
2019-12-03AE41074ND
2019-12-03AE41072ND
2019-12-03AE41070ND
2019-12-03AE41049ND
2019-12-03AE41048ND
2019-12-03AE41076ND