Dibromochloromethane

Oakdale

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	0.400 ppb	2	1	ND - 0.800 ppb
2015	0.667 ppb	3	2	ND - 1.30 ppb
2016	0.338 ppb	8	2	ND - 1.80 ppb
2017	0.900 ppb	2	2	0.700 ppb - 1.10 ppb
2018	0.250 ppb	4	1	ND - 1.000 ppb
2019	0.775 ppb	4	2	ND - 1.60 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
2014-07-21	14G2052-02	0.800 ppb
2014-07-21	14G2052-01	ND
2015-05-18	15E1325-01	ND
2015-08-11	15H0797-01	0.700 ppb
2015-08-11	15H0797-02	1.30 ppb
2016-07-19	3497708	ND
2016-07-19	3497769	ND
2016-07-19	3497755	ND
2016-07-19	3497736	ND
2016-07-19	3497668	ND
2016-07-19	3497659	ND
2016-08-10	16H0831-02	1.80 ppb
2016-08-10	16H0831-01	0.900 ppb
2017-07-13	17G0890-02	1.10 ppb
2017-07-13	17G0890-01	0.700 ppb
2018-08-07	18H0485-01	ND
2018-08-07	18H0485-02	1.000 ppb
2018-08-29	18H2504-04	ND
2018-11-28	18K1049-01	ND
2019-07-16	19G1066-01	1.60 ppb
2019-07-16	19G1066-02	1.50 ppb
2019-09-24	19I1346-03	ND
2019-09-24	19I1346-05	ND