Bromodichloromethane

Barrington

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

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	0.376 ppb	12	6	ND - 1.03 ppb
2015	0.612 ppb	2	1	ND - 1.22 ppb
2016	0.351 ppb	2	1	ND - 0.702 ppb
2017	0.579 ppb	2	2	0.568 ppb - 0.589 ppb
2018	0.483 ppb	2	1	ND - 0.965 ppb
2019	0.857 ppb	2	2	0.603 ppb - 1.11 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	Lab ID	Result
2014-02-03	4020626-01	ND
2014-02-03	4020626-02	ND
2014-02-03	4020626-03	ND
2014-02-03	4020626-04	ND
2014-04-16	4042955-01	ND
2014-04-16	4042955-02	0.678 ppb
2014-04-16	4042955-04	1.03 ppb
2014-04-16	4042955-03	0.825 ppb
2014-07-17	4073847-04	0.527 ppb
2014-07-17	4073847-03	0.599 ppb
2014-07-17	4073847-02	ND
2014-07-17	4073847-01	0.858 ppb
2015-07-21	5073938-01	ND
2015-07-21	5073938-02	1.22 ppb
2016-07-14	6072742-01	ND
2016-07-14	6072742-02	0.702 ppb
2017-07-18	7073365-01	0.568 ppb
2017-07-18	7073365-02	0.589 ppb
2018-07-19	8073755-01	ND
2018-07-19	8073755-02	0.965 ppb
2019-07-15	9072994-01	0.603 ppb
2019-07-15	9072994-02	1.11 ppb