Dibromochloromethane

Towering Oaks and Rosewood Hills Subdivisionivi

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	1.40 ppb	1	1	1.40 ppb
2015	0.675 ppb	4	1	ND - 2.70 ppb
2016	ND	4	0	ND
2017	ND	4	0	ND
2018	ND	6	0	ND
2019	ND	6	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
2014-09-03	AC65638	1.40 ppb
2015-02-23	AC81483	ND
2015-02-23	AC81473	ND
2015-02-23	AC81481	ND
2015-06-11	AC95623	2.70 ppb
2016-02-17	AD23949	ND
2016-02-17	AD23953	ND
2016-02-17	AD23945	ND
2016-09-15	AD49709	ND
2017-02-07	AD69276	ND
2017-02-07	AD69248	ND
2017-02-07	AD69250	ND
2017-05-03	AD82451	ND
2018-01-22	AE09615	ND
2018-01-22	AE09621	ND
2018-01-22	AE09611	ND
2018-06-25	AE31190	ND
2018-08-03	AE35870	ND
2018-10-30	AE44876	ND
2019-02-20	AE55073	ND
2019-02-20	AE55095	ND
2019-02-20	AE55067	ND
2019-02-20	AE55055	ND
2019-04-25	AE63736	ND
2019-07-10	AE73901	ND