Chromium (total)

Zachary Water System

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.

MORE ABOUT THIS CONTAMINANT

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	0.0617 ppb	6	1	ND - 0.370 ppb
2015	0.200 ppb	6	1	ND - 1.20 ppb
2016	ND	10	0	ND
2017	N/A	0	0	N/A
2018	ND	2	0	ND
2019	ND	8	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
2014-12-15	35168007001AM	ND
2014-12-15	35168007003AM	ND
2014-12-15	35168007005AM	0.370 ppb
2014-12-15	35168007011AM	ND
2014-12-15	35168007007AM	ND
2014-12-15	35168007009AM	ND
2015-06-08	35192184007AM	ND
2015-06-08	35192184011AM	ND
2015-06-08	35192184009AM	ND
2015-06-08	35192184001AM	ND
2015-06-08	35192184005AM	1.20 ppb
2015-06-08	35192184003AM	ND
2016-01-12	35225030003	ND
2016-01-12	35225030003	ND
2016-07-26	AE08213	ND
2016-07-26	AE08225	ND
2016-07-26	AE08221	ND
2016-07-26	AE08209	ND
2016-07-26	AE08225	ND
2016-07-26	AE08221	ND
2016-07-26	AE08213	ND
2016-07-26	AE08209	ND
2018-11-26	B1805544-001	ND
2018-11-26	B1805544-001	ND
2019-06-18	B1902537-001	ND
2019-06-18	B1902537-004	ND
2019-06-18	B1902537-003	ND
2019-06-18	B1902537-002	ND
2019-06-18	B1902537-001	ND
2019-06-18	B1902537-004	ND
2019-06-18	B1902537-003	ND
2019-06-18	B1902537-002	ND