Chromium (total)

Hartford 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.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	0.200 ppb	10	5	ND - 0.667 ppb
2014	0.112 ppb	15	5	ND - 0.380 ppb
2015	N/A	0	0	N/A
2016	N/A	0	0	N/A
2017	ND	5	0	ND
2018	N/A	0	0	N/A
2019	N/A	0	0	N/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
2013-11-18	759067-10320	0.200 ppb
2013-11-18	759065-10320	ND
2013-11-18	759069-10320	ND
2013-11-18	759061-10320	0.667 ppb
2013-11-18	759063-10320	0.354 ppb
2013-11-25	760420-10414	ND
2013-11-25	760418-10414	0.399 ppb
2013-11-25	760416-10414	0.381 ppb
2013-11-25	760412-10414	ND
2013-11-25	760414-10414	ND
2014-03-18	775371	ND
2014-03-18	775374	ND
2014-03-18	775377	ND
2014-03-18	775383	ND
2014-03-18	775380	ND
2014-05-14	785741-11394	ND
2014-05-14	785745-11371	0.380 ppb
2014-05-14	785743-11371	ND
2014-05-14	785747-11371	ND
2014-05-14	785739-11371	ND
2014-05-15	789265-11394	0.318 ppb
2014-05-15	789259-11394	0.328 ppb
2014-05-15	789267-11394	0.328 ppb
2014-05-15	789261-11394	ND
2014-05-15	789263-11394	0.324 ppb
2017-03-21	978878	ND
2017-03-21	978869	ND
2017-03-21	978881	ND
2017-03-21	978875	ND
2017-03-21	978872	ND