Chromium (total)

Bayou Liberty Water Association

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	0.0375 ppb	12	2	ND - 0.240 ppb
2014	ND	6	0	ND
2015	N/A	0	0	N/A
2016	N/A	0	0	N/A
2017	ND	6	0	ND
2018	ND	2	0	ND
2019	N/A	0	0	N/A

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
2013-04-15	3589922003AM	ND
2013-04-15	3589922011AM	ND
2013-04-15	3589922007AM	ND
2013-04-15	3589922009AM	ND
2013-04-15	3589922005AM	ND
2013-04-24	3590925001AM	ND
2013-10-23	35113304005AM	0.240 ppb
2013-12-02	35117862005AM	ND
2013-12-02	35117862001AM	0.210 ppb
2013-12-11	35119318005AM	ND
2013-12-11	35119318001AM	ND
2013-12-11	35119318003AM	ND
2014-05-27	AD91753	ND
2014-05-27	AD91743	ND
2014-05-27	AD91733	ND
2014-05-27	AD91753	ND
2014-05-27	AD91743	ND
2014-05-27	AD91733	ND
2017-05-01	AE14011	ND
2017-05-01	AE14003	ND
2017-05-01	AE13995	ND
2017-05-01	AE14011	ND
2017-05-01	AE14003	ND
2017-05-01	AE13995	ND
2018-10-30	B1805183-001	ND
2018-10-30	B1805183-001	ND