Chromium (hexavalent)

City of Boerne

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	0.0302 ppb	12	6	ND - 0.120 ppb
2014	0.0178 ppb	20	5	ND - 0.125 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
2013-12-30	4A07010-12	ND
2013-12-30	4A07010-02	0.0483 ppb
2013-12-30	4A07010-05	0.0408 ppb
2013-12-30	4A07010-03	ND
2013-12-30	4A07010-01	ND
2013-12-30	4A07010-04	ND
2013-12-30	4A07010-08	ND
2013-12-30	4A07010-10	0.0305 ppb
2013-12-30	4A07010-11	0.0706 ppb
2013-12-30	4A07010-06	0.0525 ppb
2013-12-30	4A07010-07	0.120 ppb
2013-12-30	4A07010-09	ND
2014-03-05	4C11003-02	ND
2014-03-05	4C11003-04	ND
2014-03-05	4C11003-03	ND
2014-03-05	4C11003-01	ND
2014-06-24	4G01012-09	ND
2014-06-24	4G01012-12	0.0761 ppb
2014-06-24	4G01012-10	ND
2014-06-24	4G01012-01	ND
2014-06-24	4G01012-05	ND
2014-06-24	4G01012-04	ND
2014-06-24	4G01012-06	0.0741 ppb
2014-06-24	4G01012-07	0.125 ppb
2014-06-24	4G01012-08	ND
2014-06-24	4G01012-11	0.0424 ppb
2014-07-09	4G11030-02	ND
2014-07-24	4G29013-01	ND
2014-09-15	4I19008-04	ND
2014-09-15	4I19008-01	ND
2014-09-15	4I19008-03	ND
2014-09-15	4I19008-02	0.0388 ppb