Dibromochloromethane

Georgetown Water Department

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
2014	ND	1	0	ND
2015	0.813 ppb	3	3	0.690 ppb - 0.980 ppb
2016	0.763 ppb	3	2	ND - 1.56 ppb
2017	1.10 ppb	5	4	ND - 2.11 ppb
2018	1.43 ppb	8	8	1.04 ppb - 1.84 ppb
2019	1.37 ppb	8	8	0.620 ppb - 2.57 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	Result
2014-08-04	ND
2015-08-04	0.690 ppb
2015-08-04	0.980 ppb
2015-11-02	0.770 ppb
2016-07-12	ND
2016-08-03	1.56 ppb
2016-08-03	0.730 ppb
2017-07-12	ND
2017-08-10	1.000 ppb
2017-08-10	2.11 ppb
2017-11-07	0.790 ppb
2017-11-07	1.61 ppb
2018-02-08	1.17 ppb
2018-02-08	1.83 ppb
2018-05-09	1.13 ppb
2018-05-09	1.84 ppb
2018-08-06	1.04 ppb
2018-08-06	1.80 ppb
2018-11-13	1.04 ppb
2018-11-13	1.57 ppb
2019-02-05	0.620 ppb
2019-02-05	1.48 ppb
2019-05-07	1.39 ppb
2019-05-07	1.46 ppb
2019-08-07	0.810 ppb
2019-08-07	2.57 ppb
2019-11-06	0.940 ppb
2019-11-06	1.70 ppb