Bromodichloromethane

Friendship Distribution Water

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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	0.678 ppb	2	2	0.531 ppb - 0.825 ppb
2016	0.216 ppb	43	11	ND - 1.76 ppb
2017	0.659 ppb	76	40	ND - 3.80 ppb
2018	0.975 ppb	4	2	ND - 2.50 ppb
2019	3.80 ppb	4	2	ND - 13.8 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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	0.825 ppb
2015-11-09	0.531 ppb
2016-01-13	ND
2016-04-07	ND
2016-06-29	0.708 ppb
2016-08-04	0.883 ppb
2016-08-16	0.598 ppb
2016-08-22	ND
2016-09-01	ND
2016-09-06	ND
2016-09-12	0.643 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	0.528 ppb
2016-10-13	0.847 ppb
2016-10-14	1.32 ppb
2016-10-17	ND
2016-10-18	1.76 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	0.580 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	0.638 ppb
2016-12-29	0.770 ppb
2017-01-03	0.578 ppb
2017-01-05	ND
2017-01-10	ND
2017-01-12	ND
2017-01-17	ND
2017-01-19	ND
2017-01-24	0.546 ppb
2017-01-26	ND
2017-01-31	0.794 ppb
2017-02-02	1.04 ppb
2017-02-04	ND
2017-02-09	0.908 ppb
2017-02-14	0.856 ppb
2017-02-16	1.71 ppb
2017-02-21	ND
2017-02-23	0.903 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	0.822 ppb
2017-03-30	0.607 ppb
2017-04-04	1.27 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	0.603 ppb
2017-04-27	2.27 ppb
2017-05-02	0.763 ppb
2017-05-04	ND
2017-05-09	0.796 ppb
2017-05-11	0.954 ppb
2017-05-16	ND
2017-05-18	2.32 ppb
2017-05-23	0.929 ppb
2017-05-25	ND
2017-05-30	3.66 ppb
2017-06-01	1.34 ppb
2017-06-06	1.23 ppb
2017-06-08	0.888 ppb
2017-06-13	1.45 ppb
2017-06-15	1.11 ppb
2017-06-20	0.847 ppb
2017-06-22	0.823 ppb
2017-06-27	1.33 ppb
2017-06-29	1.15 ppb
2017-07-04	2.01 ppb
2017-07-06	ND
2017-07-11	ND
2017-07-13	ND
2017-07-18	1.08 ppb
2017-07-20	0.766 ppb
2017-07-31	0.570 ppb
2017-08-02	1.37 ppb
2017-08-15	ND
2017-08-17	1.01 ppb
2017-08-22	ND
2017-08-24	1.02 ppb
2017-08-29	ND
2017-08-31	ND
2017-09-12	1.49 ppb
2017-09-14	2.60 ppb
2017-09-19	ND
2017-09-21	3.80 ppb
2017-09-26	0.830 ppb
2017-09-28	ND
2017-10-02	ND
2017-10-02	ND
2017-10-10	ND
2017-10-12	ND
2017-10-17	ND
2017-10-19	ND
2018-03-29	2.50 ppb
2018-06-07	ND
2018-09-13	ND
2018-11-15	1.40 ppb
2019-01-24	ND
2019-04-18	1.40 ppb
2019-08-08	13.8 ppb
2019-10-17	ND