Dibromochloromethane

City of Auburn

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

148

Samples

Samples exceeding legal limit (MCL)

124

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	1.26 ppb	32	25	ND - 6.60 ppb
2015	1.85 ppb	32	30	ND - 5.90 ppb
2016	1.36 ppb	33	29	ND - 5.10 ppb
2017	1.64 ppb	32	29	ND - 5.70 ppb
2018	1.70 ppb	15	11	ND - 6.00 ppb
2019	ND	4	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
2014-02-11	73337	2.00 ppb
2014-02-11	73333	0.800 ppb
2014-02-11	73338	0.900 ppb
2014-02-11	73339	1.10 ppb
2014-02-11	73334	0.900 ppb
2014-02-11	73335	0.800 ppb
2014-02-11	73332	4.10 ppb
2014-02-11	73336	ND
2014-05-07	73535	2.40 ppb
2014-05-07	73532	ND
2014-05-07	73533	1.30 ppb
2014-05-07	73539	1.000 ppb
2014-05-07	73538	ND
2014-05-07	73537	1.70 ppb
2014-05-07	73536	1.40 ppb
2014-05-07	73534	1.10 ppb
2014-08-28	74099	4.20 ppb
2014-08-28	74101	0.600 ppb
2014-08-28	74100	0.700 ppb
2014-08-28	74103	ND
2014-08-28	74098	ND
2014-08-28	74104	0.800 ppb
2014-08-28	74105	1.30 ppb
2014-08-28	74102	0.800 ppb
2014-11-18	74533	ND
2014-11-18	74530	1.000 ppb
2014-11-18	74534	1.60 ppb
2014-11-18	74529	0.900 ppb
2014-11-18	74535	0.800 ppb
2014-11-18	74532	ND
2014-11-18	74528	6.60 ppb
2014-11-18	74531	1.60 ppb
2015-02-11	74763	0.500 ppb
2015-02-11	74765	ND
2015-02-11	74766	5.20 ppb
2015-02-11	74764	2.30 ppb
2015-02-11	74767	1.80 ppb
2015-02-11	74768	1.30 ppb
2015-02-11	74762	1.40 ppb
2015-02-11	74761	1.20 ppb
2015-05-21	75020	0.700 ppb
2015-05-21	75021	0.600 ppb
2015-05-21	75017	5.90 ppb
2015-05-21	75022	2.10 ppb
2015-05-21	75018	0.900 ppb
2015-05-21	75019	0.900 ppb
2015-05-21	75015	1.30 ppb
2015-05-21	75016	0.700 ppb
2015-09-16	75481	1.30 ppb
2015-09-16	75484	1.20 ppb
2015-09-16	75479	5.70 ppb
2015-09-16	75480	2.50 ppb
2015-09-16	75477	2.30 ppb
2015-09-16	75482	2.30 ppb
2015-09-16	75478	1.80 ppb
2015-09-16	75483	2.10 ppb
2015-11-05	75642	1.50 ppb
2015-11-05	75643	1.40 ppb
2015-11-05	75640	3.30 ppb
2015-11-05	75645	2.00 ppb
2015-11-05	75646	1.20 ppb
2015-11-05	75641	1.000 ppb
2015-11-05	75647	2.70 ppb
2015-11-05	75644	ND
2016-02-10		1.10 ppb
2016-02-10		1.30 ppb
2016-02-10		1.80 ppb
2016-02-10		0.900 ppb
2016-02-10		1.000 ppb
2016-02-10		2.30 ppb
2016-02-10		1.80 ppb
2016-02-10		4.50 ppb
2016-06-02		1.10 ppb
2016-06-02		2.70 ppb
2016-06-02		5.10 ppb
2016-06-02		0.700 ppb
2016-06-02		0.700 ppb
2016-06-02		1.000 ppb
2016-06-02		0.800 ppb
2016-06-02		1.30 ppb
2016-07-07		0.500 ppb
2016-08-10		0.500 ppb
2016-08-10		1.10 ppb
2016-08-10		ND
2016-08-10		ND
2016-08-10		0.600 ppb
2016-08-10		1.000 ppb
2016-08-10		0.600 ppb
2016-08-10		1.50 ppb
2016-11-03		0.500 ppb
2016-11-03		ND
2016-11-03		4.50 ppb
2016-11-03		1.20 ppb
2016-11-03		1.40 ppb
2016-11-03		ND
2016-11-03		1.20 ppb
2016-11-03		2.10 ppb
2017-03-22		1.30 ppb
2017-03-22		1.60 ppb
2017-03-22		3.50 ppb
2017-03-22		1.60 ppb
2017-03-22		1.40 ppb
2017-03-22		0.900 ppb
2017-03-22		1.40 ppb
2017-03-22		2.30 ppb
2017-05-04		1.30 ppb
2017-05-04		1.50 ppb
2017-05-04		0.800 ppb
2017-05-04		2.90 ppb
2017-05-04		2.30 ppb
2017-05-04		1.40 ppb
2017-05-04		ND
2017-05-04		1.30 ppb
2017-08-15		1.10 ppb
2017-08-15		0.700 ppb
2017-08-15		1.40 ppb
2017-08-15		2.80 ppb
2017-08-15		1.40 ppb
2017-08-15		2.00 ppb
2017-08-15		2.20 ppb
2017-08-15		ND
2017-11-15		1.40 ppb
2017-11-15		1.60 ppb
2017-11-15		1.000 ppb
2017-11-15		1.80 ppb
2017-11-15		5.70 ppb
2017-11-15		ND
2017-11-15		2.60 ppb
2017-11-15		1.40 ppb
2018-02-08		1.40 ppb
2018-02-08		1.40 ppb
2018-02-08		1.80 ppb
2018-02-08		2.50 ppb
2018-02-08		2.10 ppb
2018-02-08		3.10 ppb
2018-02-08		6.00 ppb
2018-02-08		1.000 ppb
2018-02-08		1.50 ppb
2018-03-20		ND
2018-07-11		ND
2018-07-11		ND
2018-07-11		ND
2018-08-16		1.39 ppb
2018-08-16		3.24 ppb
2019-07-01		ND
2019-07-01		ND
2019-08-01		ND
2019-08-01		ND