Dibromochloromethane

Sun Valley Gid

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.

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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	0.888 ppb	16	6	ND - 4.30 ppb
2015	1.28 ppb	16	8	ND - 5.10 ppb
2016	1.50 ppb	16	5	ND - 9.00 ppb
2017	2.06 ppb	16	7	ND - 8.00 ppb
2018	0.606 ppb	16	5	ND - 4.70 ppb
2019	0.617 ppb	16	7	ND - 3.40 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
2014-03-12	EN2014-00001160	ND
2014-03-12	EN2014-00001159	ND
2014-03-12	EN2014-00001157	ND
2014-03-12	EN2014-00001158	ND
2014-06-05	1406380-002	ND
2014-06-05	1406380-003	ND
2014-06-05	1406380-004	ND
2014-06-05	1406380-005	ND
2014-09-03	EN2014-00004644	4.30 ppb
2014-09-03	EN2014-00004645	3.10 ppb
2014-09-03	EN2014-00004646	2.20 ppb
2014-09-03	EN2014-00004647	2.20 ppb
2014-12-08	EN2014-00006662	0.500 ppb
2014-12-08	EN2014-00006661	1.90 ppb
2014-12-08	EN2014-00006664	ND
2014-12-08	EN2014-00006663	ND
2015-03-02	EN2015-00001041	ND
2015-03-02	EN2015-00001040	ND
2015-03-02	EN2015-00001039	ND
2015-03-02	EN2015-00001038	ND
2015-06-04	EN2015-00002638	ND
2015-06-04	EN2015-00002639	ND
2015-06-04	EN2015-00002637	ND
2015-06-04	EN2015-00002636	ND
2015-09-03	EN2015-00004488	3.70 ppb
2015-09-03	EN2015-00004487	4.20 ppb
2015-09-03	EN2015-00004486	3.00 ppb
2015-09-03	EN2015-00004489	5.10 ppb
2015-12-01	EN2015-00006061	2.30 ppb
2015-12-01	EN2015-00006064	0.700 ppb
2015-12-01	EN2015-00006063	0.600 ppb
2015-12-01	EN2015-00006062	0.800 ppb
2016-03-02	EN2016-00000849	ND
2016-03-02	EN2016-00000850	ND
2016-03-02	EN2016-00000848	ND
2016-03-02	EN2016-00000847	ND
2016-06-02	EN2016-00002468	ND
2016-06-02	EN2016-00002467	ND
2016-06-02	EN2016-00002466	ND
2016-06-02	EN2016-00002469	ND
2016-09-22	201609230608	3.80 ppb
2016-09-22	201609230611	9.00 ppb
2016-09-22	201609230610	5.90 ppb
2016-09-22	201609230609	4.30 ppb
2016-12-05	EN2016-00006352	ND
2016-12-05	EN2016-00006351	ND
2016-12-05	EN2016-00006350	1.000 ppb
2016-12-05	EN2016-00006349	ND
2017-03-01	EN2017-00000882	ND
2017-03-01	EN2017-00000881	ND
2017-03-01	EN2017-00000880	ND
2017-03-01	EN2017-00000879	ND
2017-06-01	EN2017-00003396	ND
2017-06-01	EN2017-00003398	ND
2017-06-01	EN2017-00003397	ND
2017-06-01	EN2017-00003399	ND
2017-09-06	EN2017-00005369	1.90 ppb
2017-09-06	EN2017-00005370	2.70 ppb
2017-09-06	EN2017-00005371	ND
2017-09-06	EN2017-00005372	2.60 ppb
2017-12-04	EN2017-00007026	4.60 ppb
2017-12-04	EN2017-00007027	8.00 ppb
2017-12-04	EN2017-00007028	6.80 ppb
2017-12-04	EN2017-00007029	6.40 ppb
2018-03-05	EN2018-00001122	ND
2018-03-05	EN2018-00001121	ND
2018-03-05	EN2018-00001120	ND
2018-03-05	EN2018-00001119	ND
2018-06-05	EN2018-00002765	ND
2018-06-05	EN2018-00002762	ND
2018-06-05	EN2018-00002763	ND
2018-06-05	EN2018-00002764	ND
2018-09-04	EN2018-00004531	ND
2018-09-04	EN2018-00004530	4.70 ppb
2018-09-04	EN2018-00004529	1.40 ppb
2018-09-04	EN2018-00004528	2.40 ppb
2018-12-03	EN2018-00006026	0.500 ppb
2018-12-03	EN2018-00006027	ND
2018-12-03	EN2018-00006028	0.700 ppb
2018-12-03	EN2018-00006029	ND
2019-03-04	EN2019-00000848	ND
2019-03-04	EN2019-00000849	ND
2019-03-04	EN2019-00000850	ND
2019-03-04	EN2019-00000851	ND
2019-06-03	201906050398	ND
2019-06-03	201906050401	ND
2019-06-03	201906050400	ND
2019-06-03	201906050399	ND
2019-09-03	201909050600	3.40 ppb
2019-09-03	201909050602	0.910 ppb
2019-09-03	201909050601	1.90 ppb
2019-09-03	201909050599	2.00 ppb
2019-12-03	201912050481	ND
2019-12-03	201912050480	0.610 ppb
2019-12-03	201912050479	0.550 ppb
2019-12-03	201912050477	0.500 ppb