Chromium (hexavalent)

City of Humble

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	0.619 ppb	14	14	0.120 ppb - 0.800 ppb
2014	0.479 ppb	14	14	0.0800 ppb - 0.880 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
2013-09-16	2897637	0.790 ppb
2013-09-16	2897706	0.120 ppb
2013-09-16	2897795	0.610 ppb
2013-09-16	2897738	0.710 ppb
2013-09-16	2897645	0.740 ppb
2013-09-16	2897625	0.790 ppb
2013-09-16	2897657	0.710 ppb
2013-09-16	2897697	0.790 ppb
2013-09-16	2897641	0.800 ppb
2013-09-16	2897765	0.540 ppb
2013-09-16	2897715	0.750 ppb
2013-09-16	2897649	0.560 ppb
2013-12-03	2939512	0.540 ppb
2013-12-03	2939519	0.220 ppb
2014-03-20	2996246	0.1000 ppb
2014-03-20	2996254	0.780 ppb
2014-03-20	2995718	0.0800 ppb
2014-03-20	2997016	0.1000 ppb
2014-03-20	2995832	0.540 ppb
2014-03-20	2996224	0.880 ppb
2014-03-20	2996998	0.780 ppb
2014-03-20	2995813	0.370 ppb
2014-09-23	3113387	0.750 ppb
2014-09-23	3113376	0.680 ppb
2014-09-23	3113380	0.420 ppb
2014-09-23	3113379	0.630 ppb
2014-11-17	3140547	0.240 ppb
2014-11-17	3140539	0.360 ppb