Chromium (total)

Calcasieu Parish WW District No 1

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	12	0	ND
2015	0.0800 ppb	4	1	ND - 0.320 ppb
2016	ND	2	0	ND
2017	ND	8	0	ND
2018	N/A	0	0	N/A
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
2014-03-31	AD90294	ND
2014-03-31	AD90284	ND
2014-03-31	AD90279	ND
2014-03-31	AD90274	ND
2014-03-31	AD90294	ND
2014-03-31	AD90284	ND
2014-03-31	AD90279	ND
2014-03-31	AD90274	ND
2014-07-22	201407250110AM	ND
2014-07-22	201407250108AM	ND
2014-07-23	201407250106AM	ND
2014-07-23	201407250104AM	ND
2015-01-12	201501140703AM	ND
2015-01-12	201501140652AM	ND
2015-01-12	201501140899AM	ND
2015-01-12	201501140507AM	0.320 ppb
2016-10-24	35272382001	ND
2016-10-24	35272382001	ND
2017-03-13	AE13260	ND
2017-03-13	AE13256	ND
2017-03-13	AE13252	ND
2017-03-13	AE13248	ND
2017-03-13	AE13260	ND
2017-03-13	AE13256	ND
2017-03-13	AE13252	ND
2017-03-13	AE13248	ND
2019-07-16	B1903028-001	ND
2019-07-16	B1903028-001	ND