Dibromochloromethane

Clark Public Utilities

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
2013	N/A	0	0	N/A
2014	0.198 ppb	9	2	ND - 1.20 ppb
2015	0.845 ppb	2	2	0.730 ppb - 0.960 ppb
2016	0.365 ppb	4	2	ND - 0.820 ppb
2017	ND	2	0	ND
2018	ND	3	0	ND
2019	0.320 ppb	10	3	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
2014-08-26	91031	ND
2014-10-02	08661	ND
2014-10-02	08651	1.20 ppb
2014-10-27	20682	0.580 ppb
2014-10-27	20681	ND
2014-12-03	35983	ND
2014-12-03	35985	ND
2014-12-03	35982	ND
2014-12-03	35981	ND
2015-12-08	40593	0.730 ppb
2015-12-08	40594	0.960 ppb
2016-08-10		0.640 ppb
2016-08-10		0.820 ppb
2016-09-08		ND
2016-09-08		ND
2017-09-11		ND
2017-09-11		ND
2018-08-20		ND
2018-08-20		ND
2018-11-18		ND
2019-02-24		ND
2019-02-24		ND
2019-06-10		1.000 ppb
2019-06-10		ND
2019-07-22		ND
2019-08-08		ND
2019-08-08		ND
2019-09-05		ND
2019-10-10		1.20 ppb
2019-10-10		1.000 ppb