Chromium (hexavalent)

City of Katy

Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).

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	0.0698 ppb	12	11	ND - 0.106 ppb
2014	0.0262 ppb	12	8	ND - 0.0491 ppb
2015	N/A	0	0	N/A
2016	N/A	0	0	N/A
2017	N/A	0	0	N/A
2018	N/A	0	0	N/A
2019	N/A	0	0	N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.02 ppb

The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date	Lab ID	Result
2013-09-23	3I27018-01A	ND
2013-09-23	3I27018-02A	0.106 ppb
2013-09-23	3I27018-03A	0.1000 ppb
2013-09-23	3I27018-06A	0.0760 ppb
2013-09-23	3I27018-05A	0.0740 ppb
2013-09-23	3I27018-10A	0.0800 ppb
2013-09-23	3I27018-07A	0.0690 ppb
2013-09-23	3I27018-09A	0.0910 ppb
2013-09-23	3I27018-04A	0.0340 ppb
2013-09-23	3I27018-11A	0.0660 ppb
2013-09-23	3I27018-12A	0.0510 ppb
2013-09-23	3I27018-08A	0.0910 ppb
2014-03-24	4D01036-10	0.0318 ppb
2014-03-24	4D01036-02	0.0491 ppb
2014-03-24	4D01036-11	0.0340 ppb
2014-03-24	4D01036-01	ND
2014-03-24	4D01036-09	0.0446 ppb
2014-03-24	4D01036-12	ND
2014-03-24	4D01036-08	ND
2014-03-24	4D01036-07	0.0420 ppb
2014-03-24	4D01036-05	0.0394 ppb
2014-03-24	4D01036-06	ND
2014-03-24	4D01036-03	0.0411 ppb
2014-03-24	4D01036-04	0.0329 ppb