Bromoform

Crofton, City of

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
2014	0.160 ppb	4	1	ND - 0.640 ppb
2015	0.173 ppb	4	1	ND - 0.692 ppb
2016	0.455 ppb	4	2	ND - 0.990 ppb
2017	0.638 ppb	4	3	ND - 1.35 ppb
2018	0.898 ppb	4	4	0.570 ppb - 1.09 ppb
2019	0.455 ppb	4	3	ND - 0.720 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
2014-01-14	283293	ND
2014-04-14	295046	ND
2014-07-14	311961	0.640 ppb
2014-10-14	330701	ND
2015-01-12	344895	ND
2015-04-13	357604	ND
2015-07-13	374521	ND
2015-10-13	393524	0.692 ppb
2016-01-11		ND
2016-04-12		ND
2016-07-12		0.990 ppb
2016-10-17		0.830 ppb
2017-01-10		ND
2017-04-17		0.550 ppb
2017-07-10		1.35 ppb
2017-10-10		0.650 ppb
2018-01-08	532359	0.570 ppb
2018-04-09	543832	0.851 ppb
2018-07-09	561964	1.08 ppb
2018-10-10	578352	1.09 ppb
2019-01-07	590634	0.720 ppb
2019-04-09	600543	ND
2019-07-08	622427	0.520 ppb
2019-10-15	638251	0.580 ppb