Dibromochloromethane

Manchester Water Works

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)

121

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	0.200 ppb	3	1	ND - 0.600 ppb
2015	0.500 ppb	1	1	0.500 ppb
2016	0.478 ppb	37	26	ND - 0.800 ppb
2017	0.357 ppb	37	23	ND - 0.800 ppb
2018	0.697 ppb	37	37	0.500 ppb - 1.000 ppb
2019	0.818 ppb	33	33	0.500 ppb - 1.10 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
2014-02-17	1402-00336-001	ND
2014-05-14	1405-00442-001	ND
2014-08-04	1408-00056-001	0.600 ppb
2015-08-17	1508-01335-002	0.500 ppb
2016-01-26	152526.01	ND
2016-01-26	152526.02	ND
2016-01-26	152526.03	0.500 ppb
2016-01-26	152526.04	0.500 ppb
2016-01-26	152526.05	0.500 ppb
2016-01-26	152526.06	ND
2016-01-26	152526.07	0.600 ppb
2016-01-26	152526.08	0.600 ppb
2016-01-26	152526.09	0.600 ppb
2016-04-27	155361.01	0.700 ppb
2016-04-27	155361.02	0.700 ppb
2016-04-27	155361.03	0.700 ppb
2016-04-27	155361.04	0.700 ppb
2016-04-27	155361.05	0.800 ppb
2016-04-27	155361.06	0.700 ppb
2016-04-27	155361.07	0.800 ppb
2016-04-27	155361.08	0.800 ppb
2016-04-27	155361.09	0.800 ppb
2016-07-20	158484.01	0.600 ppb
2016-07-20	158484.02	0.700 ppb
2016-07-20	158484.03	0.800 ppb
2016-07-20	158484.04	0.700 ppb
2016-07-20	158484.05	0.700 ppb
2016-07-20	158484.06	0.800 ppb
2016-07-20	158484.07	0.700 ppb
2016-07-20	158484.08	0.800 ppb
2016-07-20	158484.09	0.700 ppb
2016-08-11	1608-01474-001	0.700 ppb
2016-10-20	161870.01	ND
2016-10-20	161870.03	ND
2016-10-20	161870.04	ND
2016-10-20	161870.05	ND
2016-10-20	161870.06	ND
2016-10-20	161870.07	ND
2016-10-20	161870.08	0.500 ppb
2016-10-20	161870.09	ND
2016-10-20	161870.1	ND
2017-01-24	165027.01	ND
2017-01-24	165027.02	0.500 ppb
2017-01-24	165027.03	0.600 ppb
2017-01-24	165027.04	0.500 ppb
2017-01-24	165027.05	0.600 ppb
2017-01-24	165027.06	0.500 ppb
2017-01-24	165027.07	0.500 ppb
2017-01-24	165027.08	0.500 ppb
2017-01-24	165027.09	ND
2017-04-25	167951.01	ND
2017-04-25	167951.02	0.500 ppb
2017-04-25	167951.03	0.500 ppb
2017-04-25	167951.04	0.500 ppb
2017-04-25	167951.05	ND
2017-04-25	167951.06	0.500 ppb
2017-04-25	167951.07	0.500 ppb
2017-04-25	167951.08	0.600 ppb
2017-04-25	167951.09	ND
2017-07-19	171217.01	0.700 ppb
2017-07-19	171217.02	0.700 ppb
2017-07-19	171217.03	0.600 ppb
2017-07-19	171217.04	0.600 ppb
2017-07-19	171217.05	0.700 ppb
2017-07-19	171217.06	0.800 ppb
2017-07-19	171217.07	ND
2017-07-19	171217.08	ND
2017-07-19	171217.09	0.800 ppb
2017-08-16	1708-02233-001	0.500 ppb
2017-10-17	174738.01	ND
2017-10-17	174738.02	0.500 ppb
2017-10-17	174738.03	ND
2017-10-17	174738.04	ND
2017-10-17	174738.05	ND
2017-10-17	174738.06	ND
2017-10-17	174738.07	0.500 ppb
2017-10-17	174738.08	ND
2017-10-17	174738.09	ND
2018-01-17	1801-01439-001	0.500 ppb
2018-01-17	1801-01439-002	0.500 ppb
2018-01-17	1801-01439-003	0.600 ppb
2018-01-17	1801-01439-004	0.600 ppb
2018-01-17	1801-01439-005	0.500 ppb
2018-01-17	1801-01439-006	0.500 ppb
2018-01-17	1801-01439-007	0.500 ppb
2018-01-17	1801-01439-008	0.500 ppb
2018-01-17	1801-01438-002	0.600 ppb
2018-04-25	1804-02724-001	0.600 ppb
2018-04-25	1804-02724-002	0.700 ppb
2018-04-25	1804-02724-003	0.700 ppb
2018-04-25	1804-02724-004	0.600 ppb
2018-04-25	1804-02724-005	0.700 ppb
2018-04-25	1804-02724-006	0.700 ppb
2018-04-25	1804-02724-007	0.700 ppb
2018-04-25	1804-02724-008	0.700 ppb
2018-04-25	1804-02725-001	0.600 ppb
2018-07-16	1807-01940-001	0.700 ppb
2018-07-16	1807-01940-002	0.700 ppb
2018-07-16	1807-01940-003	0.700 ppb
2018-07-16	1807-01940-004	0.700 ppb
2018-07-16	1807-01940-005	0.700 ppb
2018-07-16	1807-01940-006	0.700 ppb
2018-07-16	1807-01940-007	0.700 ppb
2018-07-16	1807-01940-008	0.700 ppb
2018-07-16	1807-01940-009	0.600 ppb
2018-09-10	1810-02544-001	0.800 ppb
2018-10-17	1810-02263-001	1.000 ppb
2018-10-17	1810-02263-002	0.900 ppb
2018-10-17	1810-02263-003	0.900 ppb
2018-10-17	1810-02263-004	0.900 ppb
2018-10-17	1810-02263-005	0.900 ppb
2018-10-17	1810-02263-006	0.900 ppb
2018-10-17	1810-02263-007	1.000 ppb
2018-10-17	1810-02263-008	0.900 ppb
2018-10-17	1810-02263-009	0.600 ppb
2019-01-16	1901-01519-001	0.600 ppb
2019-01-16	1901-01519-002	0.500 ppb
2019-01-16	1901-01519-003	0.600 ppb
2019-01-16	1901-01519-004	0.600 ppb
2019-01-16	1901-01519-005	0.700 ppb
2019-01-16	1901-01519-006	0.700 ppb
2019-01-16	1901-01519-007	0.700 ppb
2019-01-16	1901-01519-008	0.600 ppb
2019-04-29	1904-03349-001	0.700 ppb
2019-04-29	1904-03349-002	0.900 ppb
2019-04-29	1904-03349-003	0.700 ppb
2019-04-29	1904-03349-004	0.800 ppb
2019-04-29	1904-03349-005	0.800 ppb
2019-04-29	1904-03349-006	0.800 ppb
2019-04-29	1904-03349-007	0.700 ppb
2019-04-29	1904-03349-008	0.900 ppb
2019-07-17	1907-02497-001	1.10 ppb
2019-07-17	1907-02497-002	1.10 ppb
2019-07-17	1907-02497-003	1.000 ppb
2019-07-17	1907-02497-004	1.000 ppb
2019-07-17	1907-02497-005	0.900 ppb
2019-07-17	1907-02497-006	1.000 ppb
2019-07-17	1907-02497-007	0.900 ppb
2019-07-17	1907-02497-008	0.900 ppb
2019-08-13	1908-01819-001	0.600 ppb
2019-10-17	1910-02348-001	0.900 ppb
2019-10-17	1910-02348-002	0.900 ppb
2019-10-17	1910-02348-003	0.900 ppb
2019-10-17	1910-02348-004	0.900 ppb
2019-10-17	1910-02348-005	1.000 ppb
2019-10-17	1910-02348-006	0.900 ppb
2019-10-17	1910-02348-007	0.800 ppb
2019-10-17	1910-02348-008	0.900 ppb