EWG's Tap Water Database — 2019 UPDATE


Chromium (total)

Florence 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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20122.77 ppb331.50 ppb - 3.60 ppb
20140.633 ppb660.500 ppb - 1.000 ppb
20150.667 ppb660.500 ppb - 1.000 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
2012-02-23201202240031I3.20 ppb
2012-02-23201202240032I3.60 ppb
2012-02-23201202240033I1.50 ppb
2014-09-1831076430.500 ppb
2014-09-1831077060.500 ppb
2014-09-1831076240.500 ppb
2014-09-1831076480.600 ppb
2014-09-1931079850.700 ppb
2014-09-1931079811.000 ppb
2015-03-2032115080.800 ppb
2015-03-2032115041.000 ppb
2015-03-2032115260.500 ppb
2015-03-2032114930.500 ppb
2015-03-2032115220.700 ppb
2015-03-2032114890.500 ppb