Dibromochloromethane

Valdese

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	0.688 ppb	16	8	ND - 2.00 ppb
2015	0.688 ppb	16	7	ND - 3.00 ppb
2016	1.38 ppb	16	12	ND - 3.00 ppb
2017	0.294 ppb	16	4	ND - 1.30 ppb
2018	0.169 ppb	16	2	ND - 1.50 ppb
2019	0.263 ppb	16	4	ND - 1.20 ppb

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
2014-02-05	T-1402-042	1.000 ppb
2014-02-05	T-1402-041	1.000 ppb
2014-02-05	T-1402-040	1.000 ppb
2014-02-05	T-1402-039	1.000 ppb
2014-05-07	T-1405-036	ND
2014-05-07	T-1405-035	ND
2014-05-07	T-1405-034	ND
2014-05-07	T-1405-033	ND
2014-08-07	T-1408-060	ND
2014-08-07	T-1408-059	ND
2014-08-07	T-1408-058	ND
2014-08-07	T-1408-057	ND
2014-11-04	T-1411-017	2.00 ppb
2014-11-04	T-1411-016	1.000 ppb
2014-11-04	T-1411-018	2.00 ppb
2014-11-04	T-1411-019	2.00 ppb
2015-02-04		ND
2015-02-04		ND
2015-02-04		ND
2015-02-04		ND
2015-05-06		ND
2015-05-06		1.000 ppb
2015-05-06		1.000 ppb
2015-05-06		1.000 ppb
2015-08-05		1.000 ppb
2015-08-05		3.00 ppb
2015-08-05		2.00 ppb
2015-08-05		2.00 ppb
2015-11-04		ND
2015-11-04		ND
2015-11-04		ND
2015-11-04		ND
2016-02-09	T-1602-054	ND
2016-02-09	T-1602-051	ND
2016-02-09	T-1602-052	ND
2016-02-09	T-1602-053	ND
2016-05-09	T-1605-045	1.000 ppb
2016-05-09	T-1605-046	1.000 ppb
2016-05-09	T-1605-047	1.000 ppb
2016-05-09	T-1605-048	1.000 ppb
2016-08-02	T-1608-012	3.00 ppb
2016-08-02	T-1608-013	3.00 ppb
2016-08-02	T-1608-014	3.00 ppb
2016-08-02	T-1608-015	3.00 ppb
2016-11-03	T-1611-011	1.000 ppb
2016-11-03	T-1611-010	1.000 ppb
2016-11-03	T-1611-012	2.00 ppb
2016-11-03	T-1611-013	2.00 ppb
2017-02-08	T-1702-053	ND
2017-02-08	T-1702-054	ND
2017-02-08	T-1702-055	ND
2017-02-08	T-1702-056	ND
2017-05-04	T-1705-044	ND
2017-05-04	T-1705-043	ND
2017-05-04	T-1705-042	ND
2017-05-04	T-1705-041	ND
2017-08-02	38218-04	1.20 ppb
2017-08-02	38218-01	1.20 ppb
2017-08-02	38218-03	1.30 ppb
2017-08-02	38218-02	1.000 ppb
2017-11-01	42359-02	ND
2017-11-01	42359-01	ND
2017-11-01	42359-04	ND
2017-11-01	42359-03	ND
2018-02-06	46386-04	ND
2018-02-06	46386-03	ND
2018-02-06	46386-02	ND
2018-02-06	46386-01	ND
2018-05-01	50148-04	ND
2018-05-01	50148-01	ND
2018-05-01	50148-02	ND
2018-05-01	50148-03	ND
2018-08-01	54220-04	ND
2018-08-01	54220-03	1.20 ppb
2018-08-01	54220-02	ND
2018-08-01	54220-01	1.50 ppb
2018-11-13	59281-01	ND
2018-11-13	59281-02	ND
2018-11-13	59281-03	ND
2018-11-13	59281-04	ND
2019-02-05	62791-01	ND
2019-02-05	62791-02	ND
2019-02-05	62791-03	ND
2019-02-05	62791-04	ND
2019-05-07	66532-01	ND
2019-05-07	66532-04	ND
2019-05-07	66532-03	ND
2019-05-07	66532-02	ND
2019-08-06	70506-01	1.000 ppb
2019-08-06	70506-03	1.000 ppb
2019-08-06	70506-02	1.20 ppb
2019-08-07	70506-04	1.000 ppb
2019-11-05	74636-04	ND
2019-11-05	74636-03	ND
2019-11-05	74636-02	ND
2019-11-05	74636-01	ND