Chromium (total)

Warrior River Water Authority

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	0.300 ppb	6	4	ND - 0.500 ppb
2014	0.145 ppb	11	4	ND - 0.400 ppb
2015	ND	1	0	ND
2016	ND	4	0	ND
2017	ND	1	0	ND
2018	ND	1	0	ND
2019	ND	4	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
2013-10-24	2921235	ND
2013-10-24	2921040	ND
2013-10-24	2921131	0.400 ppb
2013-10-24	2921219	0.500 ppb
2013-10-24	2921028	0.400 ppb
2013-10-24	2921032	0.500 ppb
2014-01-21	2961752	ND
2014-01-21	2961568	ND
2014-04-10	3008504	0.400 ppb
2014-04-10	3008017	ND
2014-04-10	3007999	ND
2014-04-10	3008582	0.400 ppb
2014-04-10	3008587	0.400 ppb
2014-04-10	3008676	0.400 ppb
2014-06-26	140626019-1	ND
2014-07-25	3070624	ND
2014-07-25	3070583	ND
2015-09-18	150918028-1	ND
2016-03-14	160314009-1	ND
2016-03-14	160314009-3	ND
2016-03-14	160314009-4	ND
2016-03-14	160314009-2	ND
2017-04-26	170426033-1	ND
2018-02-26	180226022-1	ND
2019-08-20	20117903004_IIOC	ND
2019-08-20	20117903003_IIOC	ND
2019-08-20	20117903002_IIOC	ND
2019-08-20	20117903001_IIOC	ND