Bromoform

Guilford Water Authority

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	15	ND
2015	ND	2	ND
2016	ND	2	ND
2017	ND	6	ND
2018	ND	2	ND
2019	ND	2	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
2014-02-27	14030074-004	ND
2014-02-27	14030074-001	ND
2014-02-27	14030074-003	ND
2014-02-27	14030074-002	ND
2014-06-02	14060810-003	ND
2014-06-02	14060810-004	ND
2014-06-02	14060810-001	ND
2014-06-02	14060810-002	ND
2014-08-29	14090731-001	ND
2014-08-29	14090731-002	ND
2014-08-29	14090731-003	ND
2014-12-01	14120953-001	ND
2014-12-01	14120953-004	ND
2014-12-01	14120953-003	ND
2014-12-01	14120953-002	ND
2015-09-04	13357550	ND
2015-09-04	13357541	ND
2016-09-02	15036283	ND
2016-09-09	15036320	ND
2017-03-01	15898038	ND
2017-03-01	15898030	ND
2017-03-01	15898049	ND
2017-03-01	15898058	ND
2017-09-01	16840745	ND
2017-09-01	16840749	ND
2018-09-21	(704) SP 704	ND
2018-12-07	(702) SP 702	ND
2019-08-30	(704) SP 704	ND
2019-12-02	9L05180-01	ND