Dibromochloromethane

Friendship Distribution Water

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

129

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	0.771 ppb	2	2	0.531 ppb - 1.01 ppb
2016	0.179 ppb	43	10	ND - 1.52 ppb
2017	0.687 ppb	76	40	ND - 6.40 ppb
2018	0.575 ppb	4	2	ND - 1.50 ppb
2019	1.93 ppb	4	2	ND - 6.10 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
2015-09-09	1.01 ppb
2015-11-09	0.531 ppb
2016-01-13	ND
2016-04-07	ND
2016-06-29	ND
2016-08-04	0.987 ppb
2016-08-16	0.659 ppb
2016-08-22	0.557 ppb
2016-09-01	ND
2016-09-06	ND
2016-09-12	0.659 ppb
2016-09-15	ND
2016-09-19	ND
2016-09-22	ND
2016-09-26	ND
2016-09-29	ND
2016-10-03	ND
2016-10-06	ND
2016-10-12	ND
2016-10-13	0.643 ppb
2016-10-14	0.926 ppb
2016-10-17	ND
2016-10-18	1.52 ppb
2016-10-19	ND
2016-10-20	ND
2016-10-25	ND
2016-10-27	ND
2016-10-31	ND
2016-11-02	ND
2016-11-08	ND
2016-11-10	ND
2016-11-15	ND
2016-11-17	ND
2016-11-22	ND
2016-11-24	0.635 ppb
2016-11-29	ND
2016-12-01	ND
2016-12-06	ND
2016-12-08	ND
2016-12-13	ND
2016-12-15	ND
2016-12-20	ND
2016-12-22	ND
2016-12-27	0.532 ppb
2016-12-29	0.571 ppb
2017-01-03	ND
2017-01-05	ND
2017-01-10	ND
2017-01-12	ND
2017-01-17	ND
2017-01-19	ND
2017-01-24	ND
2017-01-26	ND
2017-01-31	0.684 ppb
2017-02-02	0.815 ppb
2017-02-04	ND
2017-02-09	0.908 ppb
2017-02-14	1.04 ppb
2017-02-16	1.39 ppb
2017-02-21	ND
2017-02-23	0.762 ppb
2017-03-02	ND
2017-03-02	ND
2017-03-14	ND
2017-03-16	ND
2017-03-21	ND
2017-03-23	ND
2017-03-28	0.681 ppb
2017-03-30	0.588 ppb
2017-04-04	1.52 ppb
2017-04-06	ND
2017-04-11	ND
2017-04-13	ND
2017-04-18	ND
2017-04-20	1.04 ppb
2017-04-25	0.685 ppb
2017-04-27	2.61 ppb
2017-05-02	0.681 ppb
2017-05-04	ND
2017-05-09	0.731 ppb
2017-05-11	0.885 ppb
2017-05-16	ND
2017-05-18	3.66 ppb
2017-05-23	0.832 ppb
2017-05-25	ND
2017-05-30	3.11 ppb
2017-06-01	1.27 ppb
2017-06-06	1.07 ppb
2017-06-08	0.809 ppb
2017-06-13	1.45 ppb
2017-06-15	1.02 ppb
2017-06-20	0.572 ppb
2017-06-22	0.733 ppb
2017-06-27	1.24 ppb
2017-06-29	1.16 ppb
2017-07-04	0.557 ppb
2017-07-06	ND
2017-07-11	ND
2017-07-13	0.514 ppb
2017-07-18	0.968 ppb
2017-07-20	ND
2017-07-31	0.682 ppb
2017-08-02	1.08 ppb
2017-08-15	0.562 ppb
2017-08-17	0.510 ppb
2017-08-22	0.598 ppb
2017-08-24	ND
2017-08-29	ND
2017-08-31	ND
2017-09-12	1.75 ppb
2017-09-14	3.96 ppb
2017-09-19	ND
2017-09-21	6.40 ppb
2017-09-26	ND
2017-09-28	ND
2017-10-02	ND
2017-10-02	ND
2017-10-10	ND
2017-10-12	ND
2017-10-17	1.20 ppb
2017-10-19	1.50 ppb
2018-03-29	0.800 ppb
2018-06-07	ND
2018-09-13	ND
2018-11-15	1.50 ppb
2019-01-24	ND
2019-04-18	1.60 ppb
2019-08-08	6.10 ppb
2019-10-17	ND