Bromoform

Southwest Harbor Water & Sewer District

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	Range of results
2014	ND	6	ND
2015	ND	10	ND
2016	ND	7	ND
2017	ND	4	ND
2018	N/A	0	N/A
2019	N/A	0	N/A

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
2014-03-18		ND
2014-06-25		ND
2014-07-23		ND
2014-08-19		ND
2014-09-29		ND
2014-12-10		ND
2015-03-17	K003543002	ND
2015-04-15	K012042002	ND
2015-05-13	K016130002	ND
2015-06-23	K020893002	ND
2015-07-15	K026713002	ND
2015-08-11	K032157002	ND
2015-09-21	K037420002	ND
2015-10-28	K041007002	ND
2015-11-18	K045676002	ND
2015-12-07	K048591002	ND
2016-04-20	L012472002	ND
2016-06-20	L020991002	ND
2016-07-05	L010655001	ND
2016-07-18	L025994002	ND
2016-09-20	L037566002	ND
2016-11-14	L037555002	ND
2016-12-13	L049264002	ND
2017-01-30	M000455002	ND
2017-04-12	1703270-02	ND
2017-05-17	1705075-02	ND
2017-06-13	1707582-02	ND