Dibromochloromethane

Alexander County Water District

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	0.313 ppb	16	4	ND - 2.00 ppb
2015	0.250 ppb	16	4	ND - 1.000 ppb
2016	0.938 ppb	16	8	ND - 2.00 ppb
2017	ND	16	0	ND
2018	ND	16	0	ND
2019	0.188 ppb	16	3	ND - 1.000 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
2014-02-04	T-1402-028	ND
2014-02-04	T-1402-027	ND
2014-02-04	T-1402-026	ND
2014-02-04	T-1402-029	ND
2014-05-06	T-1405-025	ND
2014-05-06	T-1405-024	ND
2014-05-06	T-1405-023	ND
2014-05-06	T-1405-022	ND
2014-08-05	T-1408-029	ND
2014-08-05	T-1408-028	ND
2014-08-05	T-1408-027	ND
2014-08-05	T-1408-026	ND
2014-11-04	T-1411-035	1.000 ppb
2014-11-04	T-1411-034	1.000 ppb
2014-11-04	T-1411-036	1.000 ppb
2014-11-04	T-1411-037	2.00 ppb
2015-02-10		ND
2015-02-10		ND
2015-02-10		ND
2015-02-10		ND
2015-05-12		ND
2015-05-12		ND
2015-05-12		ND
2015-05-12		ND
2015-08-04		1.000 ppb
2015-08-04		1.000 ppb
2015-08-04		1.000 ppb
2015-08-04		1.000 ppb
2015-11-03		ND
2015-11-03		ND
2015-11-03		ND
2015-11-03		ND
2016-02-02	T-1602-019	ND
2016-02-02	T-1602-020	ND
2016-02-02	T-1602-021	ND
2016-02-02	T-1602-022	ND
2016-05-03	T-1605-025	ND
2016-05-03	T-1605-026	ND
2016-05-03	T-1605-027	ND
2016-05-03	T-1605-028	ND
2016-08-09	T-1608-063	2.00 ppb
2016-08-09	T-1608-062	2.00 ppb
2016-08-09	T-1608-061	2.00 ppb
2016-08-09	T-1608-060	2.00 ppb
2016-11-08	T-1611-037	2.00 ppb
2016-11-08	T-1611-036	2.00 ppb
2016-11-08	T-1611-035	2.00 ppb
2016-11-08	T-1611-034	1.000 ppb
2017-02-07	T-1702-035	ND
2017-02-07	T-1702-034	ND
2017-02-07	T-1702-033	ND
2017-02-07	T-1702-032	ND
2017-05-02	T-1705-022	ND
2017-05-02	T-1705-020	ND
2017-05-02	T-1705-021	ND
2017-05-02	T-1705-019	ND
2017-08-08	38518-03	ND
2017-08-08	38518-02	ND
2017-08-08	38518-01	ND
2017-08-08	38518-04	ND
2017-11-07	42648-04	ND
2017-11-07	42648-01	ND
2017-11-07	42648-02	ND
2017-11-07	42648-03	ND
2018-02-13	46782-04	ND
2018-02-13	46782-03	ND
2018-02-13	46782-02	ND
2018-02-13	46782-01	ND
2018-05-08	50501-04	ND
2018-05-08	50501-01	ND
2018-05-08	50501-02	ND
2018-05-08	50501-03	ND
2018-08-07	54611-01	ND
2018-08-07	54610-01	ND
2018-08-07	54609-01	ND
2018-08-07	54608-01	ND
2018-11-06	58926-01	ND
2018-11-06	58926-02	ND
2018-11-06	58926-03	ND
2018-11-06	58926-04	ND
2019-02-05	62795-01	ND
2019-02-05	62795-02	ND
2019-02-05	62795-03	ND
2019-02-05	62795-04	ND
2019-05-07	66519-01	ND
2019-05-07	66519-04	ND
2019-05-07	66519-03	ND
2019-05-07	66519-02	ND
2019-08-06	70519-02	1.000 ppb
2019-08-06	70519-04	1.000 ppb
2019-08-06	70519-03	1.000 ppb
2019-08-06	70519-01	ND
2019-11-05	74639-04	ND
2019-11-05	74639-03	ND
2019-11-05	74639-02	ND
2019-11-05	74639-01	ND