Bromoform

Franklin County Rural Water District 4

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	0.140 ppb	4	1	ND - 0.560 ppb
2015	0.475 ppb	4	1	ND - 1.90 ppb
2016	0.163 ppb	4	1	ND - 0.650 ppb
2017	ND	4	0	ND
2018	0.193 ppb	4	1	ND - 0.770 ppb
2019	0.133 ppb	4	1	ND - 0.530 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
2014-02-10	56532	ND
2014-05-05	109171	0.560 ppb
2014-08-04	165859	ND
2014-11-10	229484	ND
2015-02-09	276188	ND
2015-05-11	331094	ND
2015-08-04	378184	ND
2015-11-16	428041	1.90 ppb
2016-02-09	490321	ND
2016-05-03	537084	0.650 ppb
2016-08-19	605952	ND
2016-11-10	657888	ND
2017-02-06	700761	ND
2017-05-23	765638	ND
2017-08-09	815067	ND
2017-11-29	883416	ND
2018-02-19	908012	ND
2018-05-23	974346	ND
2018-08-14	1024753	0.770 ppb
2018-11-27	1081162	ND
2019-03-13	1135280	ND
2019-05-21	1157768	ND
2019-09-11	1239164	ND
2019-12-11	1285773	0.530 ppb