Dibromochloromethane

Yadkin County Water - Highway 21

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	0.275 ppb	4	1	ND - 1.10 ppb
2015	1.18 ppb	4	2	ND - 3.40 ppb
2016	0.350 ppb	4	1	ND - 1.40 ppb
2017	ND	4	0	ND
2018	ND	4	0	ND
2019	ND	4	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
2014-01-06	15839-14	ND
2014-04-02	17158-14	ND
2014-07-03	92207929001DIS	1.10 ppb
2014-10-02	92219740001TTH	ND
2015-01-08		ND
2015-04-09		ND
2015-07-09		3.40 ppb
2015-10-08		1.30 ppb
2016-01-07	92282220001TTH	ND
2016-04-07	92292970001TTH	ND
2016-07-07	92304198001TTH	ND
2016-10-06	92315203001TTH	1.40 ppb
2017-01-05	92325496001TTH	ND
2017-04-06	92336225001TTH	ND
2017-07-06	92346754001TTH	ND
2017-10-05	92358010001TTH	ND
2018-01-11	92369493001TTH	ND
2018-04-05	92379793001TTH	ND
2018-07-03	92390623001TTH	ND
2018-10-02	92401713001TTH	ND
2019-01-10	92413665001_3770	ND
2019-04-04	92424111001_3770	ND
2019-07-09	92435988001_3770	ND
2019-10-08	92448586001_3770	ND