Dibromochloromethane

City of Trinidad

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	N/A	0	0	N/A
2015	ND	1	0	ND
2016	0.793 ppb	8	8	0.610 ppb - 0.970 ppb
2017	0.749 ppb	9	8	ND - 1.20 ppb
2018	0.714 ppb	9	8	ND - 0.990 ppb
2019	0.731 ppb	9	8	ND - 1.20 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
2015-07-13	ND
2016-02-08	0.720 ppb
2016-02-08	0.820 ppb
2016-05-09	0.610 ppb
2016-05-09	0.710 ppb
2016-08-15	0.760 ppb
2016-08-15	0.920 ppb
2016-11-14	0.830 ppb
2016-11-14	0.970 ppb
2017-02-06	0.770 ppb
2017-02-06	0.670 ppb
2017-05-08	0.810 ppb
2017-05-08	1.000 ppb
2017-07-10	ND
2017-08-14	0.930 ppb
2017-08-14	1.20 ppb
2017-11-06	0.630 ppb
2017-11-06	0.730 ppb
2018-02-05	0.650 ppb
2018-02-05	0.670 ppb
2018-05-07	0.740 ppb
2018-05-07	0.770 ppb
2018-07-09	ND
2018-08-06	0.810 ppb
2018-08-06	0.990 ppb
2018-11-05	0.810 ppb
2018-11-05	0.990 ppb
2019-02-04	0.660 ppb
2019-02-04	0.790 ppb
2019-05-06	0.750 ppb
2019-05-06	0.900 ppb
2019-06-24	ND
2019-08-05	1.20 ppb
2019-08-05	1.10 ppb
2019-11-04	0.530 ppb
2019-11-04	0.650 ppb