Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Chromium (total)

Lafayette

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND20ND
2014N/A00N/A
20150.144 ppb1610ND - 0.300 ppb
2016ND20ND
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
2013-12-09AI24400ND
2013-12-09AI24441ND
2015-03-1632068370.200 ppb
2015-03-163206860ND
2015-03-173208697ND
2015-03-1732081920.300 ppb
2015-06-1132603920.200 ppb
2015-06-153262411ND
2015-06-1532622890.200 ppb
2015-07-2032833470.300 ppb
2015-09-013313027ND
2015-09-0133130050.300 ppb
2015-09-0233144540.200 ppb
2015-09-0233143930.200 ppb
2015-12-073370087ND
2015-12-0733700730.200 ppb
2015-12-0933721750.200 ppb
2015-12-093371798ND
2016-10-12AJ31358ND
2016-10-12AJ31357ND