Bromoform

Franklin County Rural Water District 6

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	0.668 ppb	4	3	ND - 1.20 ppb
2015	0.178 ppb	4	1	ND - 0.710 ppb
2016	0.755 ppb	4	3	ND - 1.30 ppb
2017	0.710 ppb	3	2	ND - 1.40 ppb
2018	0.780 ppb	3	3	0.560 ppb - 1.20 ppb
2019	0.450 ppb	4	2	ND - 1.30 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
2014-03-10	76683	0.603 ppb
2014-06-10	127547	1.20 ppb
2014-09-08	191493	0.870 ppb
2014-12-08	244683	ND
2015-03-09	293670	ND
2015-06-08	346589	ND
2015-09-14	406470	0.710 ppb
2015-12-14	461870	ND
2016-03-07	506242	1.20 ppb
2016-06-13	564570	1.30 ppb
2016-09-12	622516	0.520 ppb
2016-12-13	674282	ND
2017-03-13	724163	0.730 ppb
2017-06-13	778753	ND
2017-12-11	892132	1.40 ppb
2018-03-12	937289	1.20 ppb
2018-06-12	988051	0.580 ppb
2018-09-24	1049547	0.560 ppb
2019-03-11	1135283	ND
2019-06-10	1184858	0.500 ppb
2019-09-10	1240003	ND
2019-12-02	1282494	1.30 ppb