Bromoform

Dartmouth Water Division

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

180

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	N/A	0	0	N/A
2015	0.0438 ppb	32	2	ND - 0.700 ppb
2016	0.0250 ppb	40	2	ND - 0.500 ppb
2017	0.106 ppb	36	4	ND - 1.20 ppb
2018	ND	36	0	ND
2019	ND	36	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	Result
2015-02-05	ND
2015-02-05	ND
2015-02-05	ND
2015-02-05	ND
2015-02-05	ND
2015-02-05	ND
2015-02-05	ND
2015-02-05	ND
2015-05-07	ND
2015-05-07	ND
2015-05-07	ND
2015-05-07	ND
2015-05-07	ND
2015-05-07	ND
2015-05-07	ND
2015-05-07	ND
2015-08-06	ND
2015-08-06	ND
2015-08-06	0.700 ppb
2015-08-06	0.700 ppb
2015-08-06	ND
2015-08-06	ND
2015-08-06	ND
2015-08-06	ND
2015-11-05	ND
2015-11-05	ND
2015-11-05	ND
2015-11-05	ND
2015-11-05	ND
2015-11-05	ND
2015-11-05	ND
2015-11-05	ND
2016-02-03	ND
2016-02-03	ND
2016-02-03	ND
2016-02-03	ND
2016-02-03	ND
2016-02-03	ND
2016-02-03	ND
2016-02-03	ND
2016-05-04	ND
2016-05-04	ND
2016-05-04	ND
2016-05-04	ND
2016-05-04	ND
2016-05-04	ND
2016-05-04	ND
2016-05-04	ND
2016-08-03	ND
2016-08-03	ND
2016-08-03	ND
2016-08-03	ND
2016-08-03	ND
2016-08-03	ND
2016-08-03	ND
2016-08-03	ND
2016-08-04	ND
2016-08-04	ND
2016-08-04	ND
2016-08-04	ND
2016-08-04	ND
2016-08-04	ND
2016-08-04	ND
2016-08-04	ND
2016-11-08	ND
2016-11-08	ND
2016-11-08	0.500 ppb
2016-11-08	0.500 ppb
2016-11-08	ND
2016-11-08	ND
2016-11-08	ND
2016-11-08	ND
2017-02-07	ND
2017-02-07	ND
2017-02-07	1.20 ppb
2017-02-07	1.20 ppb
2017-02-07	ND
2017-02-07	ND
2017-02-07	ND
2017-02-07	ND
2017-05-02	ND
2017-05-02	ND
2017-05-02	ND
2017-05-02	ND
2017-05-02	ND
2017-05-02	ND
2017-05-02	ND
2017-05-02	ND
2017-08-08	ND
2017-08-08	ND
2017-08-08	ND
2017-08-08	ND
2017-08-08	ND
2017-08-08	ND
2017-08-08	ND
2017-08-08	ND
2017-10-17	ND
2017-10-17	ND
2017-10-17	ND
2017-10-17	ND
2017-11-07	ND
2017-11-07	ND
2017-11-07	0.700 ppb
2017-11-07	0.700 ppb
2017-11-07	ND
2017-11-07	ND
2017-11-07	ND
2017-11-07	ND
2018-02-06	ND
2018-02-06	ND
2018-02-06	ND
2018-02-06	ND
2018-02-06	ND
2018-02-06	ND
2018-02-06	ND
2018-02-06	ND
2018-05-08	ND
2018-05-08	ND
2018-05-08	ND
2018-05-08	ND
2018-05-08	ND
2018-05-08	ND
2018-05-08	ND
2018-05-08	ND
2018-08-07	ND
2018-08-07	ND
2018-08-07	ND
2018-08-07	ND
2018-08-07	ND
2018-08-07	ND
2018-08-07	ND
2018-08-07	ND
2018-11-07	ND
2018-11-07	ND
2018-11-07	ND
2018-11-07	ND
2018-11-07	ND
2018-11-07	ND
2018-11-07	ND
2018-11-07	ND
2018-12-04	ND
2018-12-04	ND
2018-12-04	ND
2018-12-04	ND
2019-02-06	ND
2019-02-06	ND
2019-02-06	ND
2019-02-06	ND
2019-02-06	ND
2019-02-06	ND
2019-02-06	ND
2019-02-06	ND
2019-05-01	ND
2019-05-01	ND
2019-05-01	ND
2019-05-01	ND
2019-05-01	ND
2019-05-01	ND
2019-05-01	ND
2019-05-01	ND
2019-08-08	ND
2019-08-08	ND
2019-08-08	ND
2019-08-08	ND
2019-08-08	ND
2019-08-08	ND
2019-08-08	ND
2019-08-08	ND
2019-11-07	ND
2019-11-07	ND
2019-11-07	ND
2019-11-07	ND
2019-11-07	ND
2019-11-07	ND
2019-11-07	ND
2019-11-07	ND
2019-11-21	ND
2019-11-21	ND
2019-11-21	ND
2019-11-21	ND