Dibromochloromethane

Dupont Water System City Of

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	0.320 ppb	10	5	ND - 0.900 ppb
2015	0.260 ppb	5	2	ND - 0.700 ppb
2016	0.800 ppb	1	1	0.800 ppb
2017	ND	7	0	ND
2018	ND	2	0	ND
2019	ND	2	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
2014-01-22	73295	ND
2014-01-22	73296	0.600 ppb
2014-04-24	73493	ND
2014-04-24	73494	0.600 ppb
2014-06-19	73689	0.500 ppb
2014-06-19	73690	ND
2014-07-23	73835	0.600 ppb
2014-07-23	73834	ND
2014-10-28	74443	0.900 ppb
2014-10-28	74442	ND
2015-03-02	74784	0.700 ppb
2015-03-02	74783	ND
2015-03-19	74826	ND
2015-07-24	75216	ND
2015-07-27	75226	0.600 ppb
2016-07-25		0.800 ppb
2017-06-13		ND
2017-06-13		ND
2017-06-13		ND
2017-06-14		ND
2017-06-14		ND
2017-07-24		ND
2017-07-24		ND
2018-07-12		ND
2018-07-12		ND
2019-07-16		ND
2019-07-16		ND