Chromium (total)

City of Laurel

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	ND	6	0	ND
2015	0.391 ppb	11	4	ND - 1.60 ppb
2016	N/A	0	0	N/A
2017	N/A	0	0	N/A
2018	N/A	0	0	N/A
2019	0.517 ppb	6	2	ND - 2.50 ppb

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
2014-09-16	818864-12490	ND
2014-09-16	818871-12490	ND
2014-09-16	818869-12490	ND
2014-09-16	818867-12490	ND
2014-09-29	822189-12571	ND
2014-09-29	822191-12571	ND
2015-03-24	850229-13719	ND
2015-03-24	850227-13719	ND
2015-03-24	850225-13719	ND
2015-03-24	850231-13719	ND
2015-03-24	850233-13719	ND
2015-03-24	850235-13719	ND
2015-04-13	150414-005IN	ND
2015-04-13	150414-004IN	1.000 ppb
2015-04-13	150414-003IN	0.700 ppb
2015-04-13	150414-002IN	1.60 ppb
2015-04-13	150414-001IN	1.000 ppb
2019-03-25	190326-080IN	2.50 ppb
2019-03-25	190326-004IN	ND
2019-03-25	190326-003IN	0.600 ppb
2019-03-25	190326-002IN	ND
2019-10-14	191015-009IN	ND
2019-10-14	191015-010IN	ND