Chromium (hexavalent)

Connecticut Water Company - Northern Region-Western System

Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).

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	0.268 ppb	16	14	ND - 0.690 ppb
2014	0.160 ppb	2	1	ND - 0.320 ppb
2015	N/A	0	0	N/A
2016	N/A	0	0	N/A
2017	N/A	0	0	N/A
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

EWG Health Guideline 0.02 ppb

The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date	Lab ID	Result
2013-06-13	201306140129AM	0.290 ppb
2013-06-13	201306140131AM	ND
2013-06-13	201306140142AM	0.390 ppb
2013-06-17	201306180153AM	0.310 ppb
2013-06-17	201306180160AM	0.320 ppb
2013-06-17	201306180139AM	0.690 ppb
2013-06-17	201306180145AM	0.300 ppb
2013-09-09	201309100270AM	0.0380 ppb
2013-09-09	201309100225AM	0.400 ppb
2013-12-02	201312030340AM	0.300 ppb
2013-12-02	201312030327AM	0.180 ppb
2013-12-02	201312030338AM	0.360 ppb
2013-12-03	201312040752AM	0.240 ppb
2013-12-03	201312040918AM	0.310 ppb
2013-12-19	201312200095AM	ND
2013-12-19	201312200107AM	0.160 ppb
2014-03-17	201403180174AM	0.320 ppb
2014-03-17	201403180213AM	ND