Chromium (total)

Aquarion Water Company of Connecticut - Mystic

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
2014	0.0578 ppb	9	2	ND - 0.270 ppb
2015	ND	7	0	ND
2016	ND	2	0	ND
2017	ND	2	0	ND
2018	ND	2	0	ND
2019	ND	2	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
2014-05-05	201406105-IOCR	ND
2014-05-05	201406104-IOC1	ND
2014-07-07	201407080350AM	ND
2014-07-07	201407080346AM	ND
2014-07-07	201407080352AM	ND
2014-07-07	201407080348AM	ND
2014-07-21	201410322-IOC1	ND
2014-10-06	201410070394AM	0.250 ppb
2014-10-06	201410070268AM	0.270 ppb
2015-01-05	201501060323AM	ND
2015-01-05	201501060300AM	ND
2015-01-05	201501060303AM	ND
2015-04-06	201504070285AM	ND
2015-04-06	201504070275AM	ND
2015-05-04	201505517-IOCR	ND
2015-05-04	201505516-IOC1	ND
2016-05-02	201605545-IOCR	ND
2016-05-02	201605544-IOC1	ND
2017-05-02	201706331-IOCR	ND
2017-05-02	201706330-IOC1	ND
2018-05-07	201806152-IOCR	ND
2018-05-07	201806155-IOC1	ND
2019-05-07	201906217-IOCR	ND
2019-05-07	201906220-IOC1	ND