Chromium (total)

Harris County MUD 55 Heritage Park

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
2013	0.0336 ppb	16	2	ND - 0.316 ppb
2014	ND	4	0	ND
2015	N/A	0	0	N/A
2016	ND	2	0	ND
2017	ND	2	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
2013-05-23	Q1301474011	0.316 ppb
2013-05-23	Q1301474005	ND
2013-05-23	Q1301474003	ND
2013-05-23	Q1301474007	ND
2013-05-23	Q1301474009	0.222 ppb
2013-05-23	Q1301474001	ND
2013-08-27	Q1306116007	ND
2013-08-27	Q1306116003	ND
2013-08-27	Q1306116001	ND
2013-08-27	Q1306116005	ND
2013-11-04	Q1311140001	ND
2013-11-04	Q1311140011	ND
2013-11-04	Q1311140005	ND
2013-11-04	Q1311140003	ND
2013-11-04	Q1311140009	ND
2013-11-04	Q1311140007	ND
2014-02-18	Q1404898005	ND
2014-02-18	Q1404898007	ND
2014-02-18	Q1404898003	ND
2014-02-18	Q1404898001	ND
2016-02-10	AD22944	ND
2016-06-20	AD41103	ND
2017-05-24	AD85386	ND
2017-05-24	AD85387	ND
2019-02-26	AE55851	ND
2019-02-26	AE55850	ND