Dibromochloromethane

Decker Hills

Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane 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	2	0	ND
2015	ND	5	0	ND
2016	ND	5	0	ND
2017	0.260 ppb	5	1	ND - 1.30 ppb
2018	0.360 ppb	5	1	ND - 1.80 ppb
2019	ND	5	0	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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
2014-04-15	AC50585	ND
2014-07-21	AC60256	ND
2015-09-23	AD08233	ND
2015-09-23	AD08265	ND
2015-09-23	AD08263	ND
2015-09-23	AD08267	ND
2015-09-23	AD08259	ND
2016-06-01	AD38959	ND
2016-06-01	AD38987	ND
2016-06-01	AD38989	ND
2016-06-01	AD38973	ND
2016-06-01	AD38981	ND
2017-08-07	AD92273	ND
2017-08-25	AD94483	1.30 ppb
2017-08-25	AD94469	ND
2017-08-25	AD94481	ND
2017-08-25	AD94475	ND
2018-07-09	AE32617	ND
2018-07-09	AE32630	1.80 ppb
2018-07-09	AE32626	ND
2018-07-09	AE32644	ND
2018-07-09	AE32636	ND
2019-03-19	AE59039	ND
2019-03-19	AE59055	ND
2019-03-19	AE59037	ND
2019-03-19	AE59057	ND
2019-07-09	AE73676	ND