Chromium (total)

Assumption Parish Waterworks District 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
2013	0.273 ppb	4	4	0.260 ppb - 0.280 ppb
2014	ND	12	0	ND
2015	ND	2	0	ND
2016	ND	2	0	ND
2017	ND	2	0	ND
2018	ND	2	0	ND
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
2013-07-30	35102554001AM	0.260 ppb
2013-07-30	35102554003AM	0.280 ppb
2013-11-26	35117623001AM	0.270 ppb
2013-11-26	35117623003AM	0.280 ppb
2014-01-21	35123746001AM	ND
2014-01-21	35123746003AM	ND
2014-02-03	AD88658	ND
2014-02-03	AD88658	ND
2014-04-14	AD90506	ND
2014-04-14	AD90506	ND
2014-04-21	35134965001AM	ND
2014-04-21	35134965003AM	ND
2014-07-21	AD93828	ND
2014-07-21	AD93828	ND
2014-10-06	AD98330	ND
2014-10-06	AD98330	ND
2015-03-31	35181766003	ND
2015-03-31	35181766003	ND
2016-03-15	35234393001	ND
2016-03-15	35234393001	ND
2017-01-31	35292293003	ND
2017-01-31	35292293003	ND
2018-01-25	35370415008	ND
2018-01-25	35370415008	ND
2019-01-29	35445085001	ND
2019-01-29	35445085001	ND