Bromoform

Boston Harbor

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform 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	2	0	ND
2015	ND	12	0	ND
2016	ND	8	0	ND
2017	ND	14	0	ND
2018	0.157 ppb	12	4	ND - 0.650 ppb
2019	ND	2	0	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform 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
2014-10-16	13571	ND
2014-12-24	14683	ND
2015-03-25	15813	ND
2015-03-31	15849	ND
2015-06-02	16841	ND
2015-06-02	16843	ND
2015-08-11	17962	ND
2015-08-11	17964	ND
2015-09-16	18576	ND
2015-09-16	18577	ND
2015-11-10	19574	ND
2015-11-10	19573	ND
2015-12-07	19956	ND
2015-12-07	19954	ND
2016-03-08		ND
2016-03-15		ND
2016-06-14		ND
2016-06-14		ND
2016-09-13		ND
2016-09-13		ND
2016-12-12		ND
2016-12-12		ND
2017-01-31		ND
2017-01-31		ND
2017-01-31		ND
2017-01-31		ND
2017-02-07		ND
2017-02-07		ND
2017-02-07		ND
2017-06-27		ND
2017-06-27		ND
2017-08-16		ND
2017-08-16		ND
2017-08-16		ND
2017-11-15		ND
2017-11-15		ND
2018-03-30		ND
2018-03-30		ND
2018-05-31		ND
2018-05-31		ND
2018-06-11		0.390 ppb
2018-06-11		0.330 ppb
2018-08-28		ND
2018-08-28		ND
2018-08-28		0.510 ppb
2018-09-24		0.650 ppb
2018-11-15		ND
2018-12-11		ND
2019-03-05		ND
2019-03-05		ND