Dibromochloromethane

Huntley

Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

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	N/A	0	0	N/A
2014	0.578 ppb	12	9	ND - 0.933 ppb
2015	0.703 ppb	2	2	0.557 ppb - 0.848 ppb
2016	0.984 ppb	2	2	0.827 ppb - 1.14 ppb
2017	0.854 ppb	2	2	0.849 ppb - 0.858 ppb
2018	0.901 ppb	2	2	0.845 ppb - 0.957 ppb
2019	0.792 ppb	2	2	0.660 ppb - 0.924 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-01-16	4012969-01	0.730 ppb
2014-01-16	4012969-02	0.635 ppb
2014-01-16	4012969-03	ND
2014-01-16	4012969-04	0.808 ppb
2014-04-16	4042904-01	0.896 ppb
2014-04-16	4042904-02	0.750 ppb
2014-04-16	4042904-04	0.933 ppb
2014-04-16	4042904-03	ND
2014-07-15	4072805-04	0.873 ppb
2014-07-15	4072805-03	ND
2014-07-15	4072805-02	0.682 ppb
2014-07-15	4072805-01	0.625 ppb
2015-10-06	5101422-01	0.557 ppb
2015-10-06	5101422-02	0.848 ppb
2016-10-06	6101320-01	0.827 ppb
2016-10-06	6101320-02	1.14 ppb
2017-10-05	7101183-01	0.858 ppb
2017-10-05	7101183-02	0.849 ppb
2018-10-04	8101305-01	0.957 ppb
2018-10-04	8101305-02	0.845 ppb
2019-10-10	9102536-01	0.660 ppb
2019-10-10	9102536-02	0.924 ppb