Bromoform

Gibson Hill Park

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	N/A	0	N/A
2015	ND	6	ND
2016	ND	10	ND
2017	ND	8	ND
2018	ND	2	ND
2019	ND	1	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
2015-05-15	E505E72-2VOC	ND
2015-05-15	E505E72-3VOC	ND
2015-07-28	BJ65003VOC1	ND
2015-07-28	BJ65002VOC1	ND
2015-12-17	BK40657VOC1	ND
2015-12-17	BK40656VOC1	ND
2016-01-28	BK59083VOC1	ND
2016-01-28	BK59084VOC1	ND
2016-06-23	BN62337VOC1	ND
2016-06-23	BN62336VOC1	ND
2016-09-28	BV31614VOC1	ND
2016-09-28	BV31613VOC1	ND
2016-10-31	BV71657VOC1	ND
2016-10-31	BV71658VOC1	ND
2016-12-28	BX13466VOC1	ND
2016-12-28	BX13465VOC1	ND
2017-01-26	BX39627VOC1	ND
2017-01-26	BX39626VOC1	ND
2017-06-15	BY41546VOC1	ND
2017-06-15	BY41545VOC1	ND
2017-07-25	BY72564VOC1	ND
2017-07-25	BY72563VOC1	ND
2017-11-16	BZ43705VOC1	ND
2017-11-16	BZ43704VOC1	ND
2018-02-13	BZ89012VOC1	ND
2018-02-13	BZ89013VOC1	ND
2019-11-05	CE54972	ND