Dibromochloromethane

Farmington

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	0.475 ppb	4	2	ND - 1.000 ppb
2015	0.200 ppb	4	1	ND - 0.800 ppb
2016	0.243 ppb	7	2	ND - 0.900 ppb
2017	0.600 ppb	3	2	ND - 1.000 ppb
2018	0.283 ppb	6	2	ND - 0.900 ppb
2019	2.65 ppb	2	2	2.60 ppb - 2.70 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
2014-03-05	14C0164-01	ND
2014-03-05	14C0160-01	ND
2014-09-15	14I0657-01	1.000 ppb
2014-09-15	14I0657-02	0.900 ppb
2015-04-22	15D1508-01	ND
2015-04-22	15D1508-03	ND
2015-09-15	15I0744-01	ND
2015-09-15	15I0744-02	0.800 ppb
2016-03-28	3420914	ND
2016-03-28	3420966	ND
2016-03-28	3420958	ND
2016-03-28	3420947	ND
2016-03-28	3420923	ND
2016-09-20	16I1145-02	0.900 ppb
2016-09-20	16I1145-01	0.800 ppb
2017-02-01	17B0071-01	ND
2017-09-14	17I0649-02	0.800 ppb
2017-09-14	17I0649-01	1.000 ppb
2018-01-03	18A0035-01	ND
2018-01-03	18A0035-02	ND
2018-01-03	18A0035-03	ND
2018-01-03	18A0035-04	ND
2018-09-18	18I0836-01	0.800 ppb
2018-09-18	18I0836-02	0.900 ppb
2019-09-16	19I0879-01	2.70 ppb
2019-09-16	19I0879-02	2.60 ppb