Bromodichloromethane

Duncan, Village of

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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	ND	4	0	ND
2015	0.403 ppb	4	2	ND - 1.08 ppb
2016	0.235 ppb	5	2	ND - 0.646 ppb
2017	0.715 ppb	4	2	ND - 1.45 ppb
2018	0.208 ppb	4	1	ND - 0.830 ppb
2019	1.07 ppb	5	5	0.660 ppb - 2.38 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2014-01-21	278561	ND
2014-04-07	293558	ND
2014-07-07	309828	ND
2014-10-06	328707	ND
2015-01-05	343430	ND
2015-04-06	353686	0.533 ppb
2015-07-06	372092	ND
2015-10-05	392382	1.08 ppb
2016-01-20		0.646 ppb
2016-04-04		ND
2016-07-05		0.530 ppb
2016-09-19		ND
2016-10-11		ND
2017-03-06		1.45 ppb
2017-06-12		ND
2017-09-05		ND
2017-10-16		1.41 ppb
2018-01-02	530843	0.830 ppb
2018-04-03	542883	ND
2018-07-09	560193	ND
2018-10-15	577046	ND
2019-01-14	590577	0.780 ppb
2019-04-01	602878	0.840 ppb
2019-07-08	621137	0.670 ppb
2019-09-09	630435	2.38 ppb
2019-10-21	638589	0.660 ppb