Bromoform

Wahiawa

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
2013	N/A	0	0	N/A
2014	N/A	0	0	N/A
2015	0.700 ppb	4	2	ND - 1.60 ppb
2016	0.515 ppb	4	2	ND - 1.40 ppb
2017	0.227 ppb	7	2	ND - 0.960 ppb
2018	0.518 ppb	4	2	ND - 1.10 ppb
2019	0.460 ppb	5	2	ND - 1.40 ppb

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
2015-01-12	201501130202	ND
2015-01-14	201501150365	ND
2015-10-14	201509160119	1.20 ppb
2015-10-14	201509160120	1.60 ppb
2016-01-26		ND
2016-01-26		ND
2016-10-05		0.660 ppb
2016-10-05		1.40 ppb
2017-01-30		ND
2017-01-30		ND
2017-03-20		ND
2017-03-20		ND
2017-10-06		0.960 ppb
2017-10-06		0.630 ppb
2017-11-20		ND
2018-01-29	201801300812	ND
2018-04-18	201804200571	ND
2018-10-03	201810050562	0.970 ppb
2018-10-15	201810170496	1.10 ppb
2019-01-31	201902010243	ND
2019-01-31	201902010244	ND
2019-05-01	201903280505	ND
2019-10-03	201910040328	0.900 ppb
2019-10-03	201910040329	1.40 ppb