Chromium (total)

Aquarion Water Company of Connecticut - Valley System

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.

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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	0.0964 ppb	14	5	ND - 0.320 ppb
2014	ND	5	0	ND
2015	N/A	0	0	N/A
2016	ND	3	0	ND
2017	N/A	0	0	N/A
2018	N/A	0	0	N/A
2019	ND	3	0	ND

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
2013-06-06	201306070176AM	ND
2013-06-06	201306070273AM	0.210 ppb
2013-06-06	201306070298AM	0.300 ppb
2013-06-06	201306070232AM	0.320 ppb
2013-06-06	201306070226AM	ND
2013-06-06	201306070098AM	0.260 ppb
2013-09-05	201309060358AM	0.260 ppb
2013-09-05	201309060394AM	ND
2013-12-03	201312040688AM	ND
2013-12-03	201312040709AM	ND
2013-12-03	201312040681AM	ND
2013-12-03	201312040722AM	ND
2013-12-03	201312040656AM	ND
2013-12-03	201312040936AM	ND
2014-02-06	201401778-IOC1	ND
2014-02-06	201401783-IOC1	ND
2014-02-06	201401781-IOC1	ND
2014-03-19	201403200271AM	ND
2014-03-19	201403200579AM	ND
2016-02-03	201601668-IOC1	ND
2016-02-03	201601672-IOC1	ND
2016-02-03	201601674-IOC1	ND
2019-02-05	201901650-IOC1	ND
2019-02-05	201901652-IOC1	ND
2019-12-16	201920349-IOC1	ND